The Digital Public Library of America (DPLA) serves as a portal to the digital collections of more then 40 state, regional, and online-only libraries, museums, archives, and other cultural institutions. Created to strengthen access to public resources and to "create novel environments for learning, tools for discovery, and engaging apps," the DPLA is an invaluable first stop for teachers and students looking for primary sources, particularly regional history sources.

Visitors to the website can search the more than 4,500,000 objects in the collections of participating institutions using keywords, returning results they can filter by format, owning institution, partner, date, language, location, and subject. Clicking on an object brings up detailed metadata, including creator, date of creation, and a description of the object, as well as a link to its original location online. Visitors who create a free account can save their search results, make them private or public, and share them via Facebook, Twitter, or Google+.

Visitors can also browse objects on a map or timeline—a fantastic way to prompt thinking about how primary sources are located in time and space. The timeline stretches from 1000 BCE to the present. (Note that zooming into the map returns finer results.) In addition, more than eight virtual exhibits demonstrate how DPLA sources can be curated to tell stories about themes and events.

The DPLA's API (application programming interface) allows visitors with the know-how to create apps drawing on the DPLA's collections. An eclectic set of more than 10 apps lets visitors browse DPLA's search results as a "river of images," discover primary sources related to their Zotero bibliographies, and more.

A fantastic starting point for anyone looking for primary sources, teachers can feel confident pointing students towards the DPLA to begin research projects or turning to the DPLA themselves to find resources to support lesson plans.

This massive mega-website presents thousands of documents and images related to Missouri's social, political, and economic history, linking to collections housed at universities, libraries, and heritage sites across the state. These resources are organized both into archival collections (by topic and source type) and virtual exhibits.

Archival collections include maps, municipal records, government and political records, newspapers, photographs and images, books and diaries, as well as topical collections on agriculture, medicine, women, business, exploration and settlement, art and popular culture, and family, rendering the website's resources as useful for genealogists as for those interested in history.

Exhibits encompass a diverse range of subjects, and include topics of relevance to Missouri history (Miss Carrie Watkins's cookbook from the mid-19th century, several exhibits on life at the University of Missouri and Washington University, Truman's Whistle Stop campaign), and topics outside of Missouri (the body in Medieval manuscripts, Roman imperial coins, propaganda posters from World War II, and drawings documenting dinosaur discovery before the mid-20th century).

Teachers will be especially interested in the large Education section, which includes curricular resources on topics such as African Americans in Missouri, Lewis and Clark's Expedition, Missouri State Fairs, and the history of dueling.

This website offers an archive of more than 35,000 items from 75 individual collections at nearly 30 institutions in Illinois. Items include black-and-white and color photographs, post cards, audio recordings, maps, books, newspaper articles, newsletters and bulletins, handbills, and film clips. The focus of all the collections is the history of Illinois, its places, and people. A strength of the collections is the large number of photographs of residential and commercial buildings from cities and towns throughout Illinois.

Visitors can browse the contents of all collections by city, organization, or proper name. Once in a collection, other collections can be individually browsed by selecting from the collections dropdown menu. All collections are searchable by such fields as subject, description, creator, publisher, contributors, date, type, or format. Clicking on the thumbnail image brings up a new window with a large image and descriptive data. There are also 14 exhibits on various topics such as "History of Park Ridge, 1841-1926" and "Brides of Yesteryear." This is a useful collection of primary source material on the social and cultural history of Illinois.

This photograph archive contains more than 900 images made by American photographer William Henry Jackson (1843–1942) during his tour of North Africa, Asia, Russia, Australia, and Oceania from 1894 to 1896. The World's Transportation Commission, an organization formed to aid American business interests abroad, commissioned Jackson for this trip.

The photographs, originally exhibited in Chicago's Field Columbian Museum, focus on transportation systems, especially railroads, as well as tourist sites, indigenous life, wildlife, and locations of natural beauty. Nearly 687 of the images are from lantern slides, many of which were hand-colored. Many of the photographs appeared in Harper's Weekly. This collection is valuable for those interested in late 19th-century photography, colonialism, and industrialization.

The Community of the Sisters of Charity, an order of the Congregation of the Mission founded by St. Vincent De Paul and dedicated to teaching and nursing, was founded in the U.S. in 1809 by St. Elizabeth Seton (1774-1821). This collection of 580 postcards "documents the spirituality and mission of the Vincentians" and includes images of institutions such as hospitals, churches, and seminaries in many U.S. states including California, Illinois, Indiana, Kansas, Kentucky, Louisiana, Missouri, Maryland, and Massachusetts. "Spanning 200 years, these postcards reflect the heritage of the religious orders, the growth of social institutions, advancements in technology, and changes in urban environments." Visitors can browse the full collection or use advanced and simple searches to locate images of particular interest. Full bibliographic information accompanies each image. This archive is of interest to anyone researching the history of religious institutions in 19th- and 20th-century America.

This well-designed site presents the Nebraska edition of the Lewis and Clark journals, edited by Gary E. Moulton. The site provides the complete text of all the journals from the 1803–1806 expedition, as well as introductions, prefaces, and sources. The material is searchable by keyword and phrase.

There are 29 scholarly essays about the expedition. An image gallery offers 124 images of pages from the journals, 95 images of people and places, and 50 images of plants and animals encountered on the expedition. The maps section includes 12 explanatory maps and nine images of maps from the journals. Additionally, there are 27 audio excerpts of journal readings and eight video interviews with the editor of the project. The website stands as an outstanding resource for researching the history of the Lewis and Clark expedition.

This site is a collection of 253 travel narratives written between 1750 and 1920. The narratives were written by American citizens and foreign visitors about their travels in America. Some of the accounts were written by famous Americans (James Fenimore Cooper and Washington Irving, for example), but most of the authors were not famous. The narratives include their observations and opinions about American people, places, and society; and are valuable sources for the study of early American attitudes. Most accounts are viewable either as scanned images or as transcribed texts. Also included is the 32-volume set of manuscript sources entitled Early Western Travels, 1748-1846. The collection is searchable by keyword, and may be browsed by subject, author, and title. Students and teachers will find these primary sources invaluable for research and study of the late 18th and 19th centuries.

Visitors to this site are invited to explore historical aspects of the roughly 200 National Park Service locations designated important to U.S. history and prehistory. Materials are organized by "cultural resource subjects," including archeology, architecture and engineers, cultural groups, cultural landscapes, historic buildings, mapping, maritime and military history, and "cultural resource programs," such as the American Indian Liaison Program and Heritage Preservation Services.

Visitors can search for information on more than 2.5 million Civil War soldiers and sailors; more than 71,000 properties listed in the National Register of Historic Places; and approximately 240,000 reports on federal archaeological projects in the National Archaeological Database. National Register Travel Itineraries provide historic guides to 18 cities and communities. The National Underground Railroad Network to Freedom contains information on 51 sites of importance and on slavery and antislavery efforts.

Also of interest are bibliographies on the African American west and public history, and full-text publications on the Antiquities Act of 1906 and the promotion of the city of Seattle during the gold rush era. The homepage—"History and Culture"—presents several topical, comprehensive historical exhibits including the "Eisenhower Virtual Museum."

By the time Thomas Jefferson became the third President of the United States in 1801, interest in exploring the West had begun to shape U.S. policy. This chronological narrative traces Jefferson's life, participation in politics, and accumulation of scientific geographical knowledge from 1735 to 1804. There are four main sections: "The Jeffersons and Their Frontier Virginia Neighborhood," "From Colony to Commonwealth," "Science and Statecraft at Home and Abroad," and "Public Servant to the Early Republic."

This narrative is accompanied by an archive of 169 letters, statues, books, treaties, maps, and journals providing primary source insight into Jefferson's thoughts about the West and the Lewis and Clark expedition in particular. Three interactive maps from the 1700s, overlaid with historical data about cities, private dwellings, natural features, courthouses, and waterways, provide important insight into the geographic and social environment at the time.

The Betty H. Carter Women Veterans Historical Project provides access to a wide variety of sources related to the role of women in the military. These document the female war experience, how male-female integration has changed the armed forces, and more.

Sources available through this collection include diaries, oral histories, uniforms, military patches, scrapbooks, posters, books or pamphlets, photographs, and letters. The oral histories alone number more than 300, and are available as transcripts.

There are three ways to access the site content. You can either run a keyword search; select a military branch or related organization—Air Force, Army, Coast Guard, Marines, Navy, Red Cross, Cadet Nurse Corps, or foreign and/or civilian; or select a conflict—World War I, World War II, the Korean War, the Vietnam War, Post-Vietnam/1980s, or Gulf War/War on Terrorism. Selecting a branch or conflict will provide a list of the types of sources available, as well as how many of each there are. Select your source type of interest to see the individual items.