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 website is a detailed look at the Montgomery Bus Boycott of 1955–1956 as covered in the Montgomery Advertiser. It includes more than 20 oral histories, more than 40 archival news stories, and more than 20 images of the event. A 3,000-word overview section provides details regarding the boycott, the people involved, why it occurred, and the outcome. A biography section includes more details regarding the individuals involved with the boycott. A memorial page for Rosa Parks, one of the most visible figures of the Montgomery Bus Boycott, includes photos, videos, and news articles from the Montgomery Advertiser regarding her death. "Voices of the Boycott" includes oral histories from the participants of the boycott.

The site also includes an archive of stories from the Montgomery Advertiser and the Associated Press regarding the boycott. This includes front page stories, as well as smaller news stories from within the newspaper. Finally a photo gallery contains booking photos, images of speeches, and photos of the events. None of the images in the gallery are graphic in nature.

Though the site is very user-friendly and all information easily accessible, it is somewhat limited in its focus on primary sources directly tied to the Montgomery Advertiser. Still, this website could potentially be useful for educators and students looking to supplement their studies on the U.S. Civil Rights Movement, especially due to the inclusion of the oral histories.

The private organization behind this website is in the process of digitizing millions of records from the Lincoln Administration (March 4, 1861, through April 15, 1865), drawing from collections at the National Archives; the State Treasury, Justice, and War Departments; and other federal offices and agencies.

These records include pardon case files, applications for Federal jobs, the papers of Generals Ambrose Burnside and Henry Halleck, records on the capture of Jefferson Davis and the John Surratt trial, and numerous telegrams and letters about all aspects of Presidential business, as well as maps, photographs, and newspaper articles.

Though the majority of these records are accessible by subscription only ($150/year for individuals, more for school districts and libraries), a few are freely available at the website: thumbnails of 35 photographs (most available in higher quality elsewhere), and roughly 50 political cartoons (too small to read).

More useful for the non-subscriber is the inclusion of 100-200 word descriptions of many of the newspaper publications included in the archive, as well as video footage of several scholarly conferences and presentations about Lincoln.

An interactive timeline of Lincoln's entire life is also included, interspersed with video footage of scholars discussing important events, as well as staged audio recordings of several of Lincoln's letters and speeches, such as a letter he wrote to Mary Owens in 1837 before she broke off their courtship.

For teachers, the website presents a list of 20 links to outside lesson plans covering many themes in Lincoln's life and Presidency.

This archive offers a collection of more than 900,000 photographs, maps, letters, documents, books, artifacts, and other items relating to all aspects of Texas history, from prehistory through the 20th century. Subjects include agriculture, arts and crafts, education, immigration, military and war, places, science and technology, sports and recreation, architecture, business and economics, government and law, literature, people, religion, social life and customs, and the Texas landscape and nature. Some subjects include sub-categories. For instance, social life and customs, with 694 items, includes 13 sub-categories, such as clothing, families, food and cooking, homes, slavery, and travel. The visitor can also search the collection by keyword.

Resources for educators include seven "primary source adventures," divided into 4th- and 7th-grade levels, with lesson plans, preparatory resources, student worksheets, and PowerPoint slideshows. Subjects of the lessons include Cabeza de Vaca, Hood's Texas Brigade in the Civil War, life in the Civilian Conservation Corps, the journey of Coronado, the Mier Expedition, runaway slaves, the Shelby County Regulator Moderator war, and a comparison of Wichita and Comanche village life. This website offers useful resources for both researching and teaching the history of Texas.

The stated purpose of this website is to provide an overview of World War I. This it does effectively through hundreds of essays, 3,100 encyclopedic entries, 618 biographies, 318 resources on the war's major diplomatic and military events, and a timeline. Primary documents include over 100 diaries and firsthand accounts of soldiers and politicians, 3,900 photographs, 651 propaganda posters, and 155 audio files of songs and speeches. Documents include treaties, reports, correspondence, memoirs, speeches, dispatches, and accounts of battles and sieges.

The site also provides 95 essays on literary figures who wrote about the war. While admittedly a work-in-progress, the site offers much material on the leaders who engaged their countries in war and on the experiences of ordinary soldiers who fought the battles.

Emma Goldman (1869–1940) was a major figure in the radical and feminist movements in the United States prior to her deportation in 1919. This collection of primary resources includes selections from four books by Goldman as well as 18 published essays and pamphlets, four speeches, 49 letters, and five newspaper accounts of Goldman's activities.

There are also nearly 40 photographs, illustrations, and facsimiles of documents. Additional items include two biographical exhibitions, selections from a published guide of documentary sources, and four sample documents from the book edition of her papers. A curriculum for students is designed to aid the study of freedom of expression, women's rights, anti-militarism, and social change. The site offers essays on the project's history and bibliographic references as well as links to other websites.

This interactive case study explores the 18th-century diary of midwife Martha Ballard and the construction of two late 20th-century historical studies based on the diary: historian Laurel Thatcher Ulrich's book A Midwife's Tale and Laurie Kahn-Leavitt's PBS film by the same name.

The site provides facsimile and transcribed full-text versions of the 1,400-page diary. An archive offers images of more than 50 documents on such topics as Ballard's life, domestic life, law and justice, finance and commerce, geography and surveying, midwifery and birth, medical information, religion, and Maine history. Also included are five maps, present-day images of Augusta and Hallowell, ME, and a timeline tracing Maine's history, the history of science and medicine, and a history of Ballard and Hallowell. The site offers suggestions on using primary sources to conduct research, including essays on reading 18th-century writing and probate records, searching for deeds, and exploring graveyards. A bibliography offers nearly 150 scholarly works and nearly 50 websites.