Within this site—designed primarily to aide social science researchers and analysts to construct large quantitative studies that can produce analytic results quickly—historians can find studies of importance relating to trends and shifts in American attitudes and opinions. The site presents 12 surveys on race and politics, Italian prejudice, health issues, and voter attitudes since 1952, among other topics.

Perhaps the most useful to historians of the late 20th century will be the General Social Survey, an "almost annual" study since 1972 that has interviewed U.S. households to produce a set of variables covering attitudes on an eclectic range of topics—from abortion to zodiac signs—that have been chosen by experts as "strategic for social science research" and related to public policy. Since 1982, surveys in other countries have replicated questions so that cross-national analyses may be achieved.

Includes data on beliefs concerning welfare, free speech, gun control, class structure, pornography, race, media exposure, working mothers, and women's rights, among other topics. Contains links to eight additional sites that use SDA. Valuable for those studying American social history.

Presents more than 200 items—including 51 articles, 28 lectures, 84 letters, and 35 photographs—by and about the Nobel-winning geneticist Barbara McClintock (1902–1992). Through experiments with maize in the 1920s and 1930s, McClintock discovered that genetic changes occur when chromosomes break and recombine, a process called "crossing over." In the 1950s, upon finding that genes "jump" around, she investigated the effects of transposable genetic elements.

The site includes an exhibit divided into seven chronological sections with a 4,000-word essay presenting McClintock's career highlights, accompanied by links to relevant documents and visuals. Materials in the collection can be retrieved through searches—basic and also geared to scientists—and in chronological and alphabetical listings. Valuable for serious students of genetics as well as those studying the history of American science and professional women.

This photographic archive contains more than 1,500 images commissioned by the Pittsburgh Department of Public Works, Division of Photography, from c1890 through 1973. "The images show Pittsburgh parks, recreation facilities, and athletic events as well as hospital exteriors and interiors, mayoral events, traffic situations, and general street scenes."

The image collection emphasizes interior and exterior photographs of familiar and historic buildings and "interesting depictions of home life, and the famous and not so famous people of Pittsburgh." Each image is accompanied by bibliographic and descriptive information. The archive can be searched by image title, date, creator, location, address, description, or subject. A useful resource for those interested in urban development, city life, and architecture.

This collection of more than 160 texts, maps, photographs, and sketches is focused on the people, themes, and organizations important to Reston's history as a planned community. Textual materials include deeds, certificates, promotional brochures, studies, reports, and correspondence. Maps include Reston's Master Plan, major road systems, educational facilities, and recreational areas. Photographs include Lake Anne, various physical structures, and people significant to Reston's history. Sketches are mostly of building and community plans. Subject areas include health care, education, public services, parks, recreation, transportation, and population.

The collection can be browsed by title, subject, people, or organization and it can also be searched by subject, personal name, corporate name, or title. This is a website of interest to those researching the history of Reston or of planned communities.

Documenting more than 5,000 years of sewage history, this site contains a plethora of sources addressing the historical, cultural, engineering, and even literary aspects of sewers. Beginning in roughly 3,500 BCE and continuing into the 20th century, the site includes a detailed timeline of major sewage developments, as well as links to histories of 14 major cities' sewage systems, including Washington, DC and Los Angeles.

In addition to two histories of the modern toilet, there are more than two dozen articles about aspects of sewage design, including short (500–1,000 word) introductions, engineering text, and even PDF diagrams. As well, there is a feature highlighting the many animals found living in metropolitan sewers and a virtual tour of the Paris, France, sewer system. A bibliography introduces users and researchers to major secondary works on sewage and sewer history. A Miscellaneous area collects literary references to sewers, including works by Robert Frost and Ben Jonson.

Designed as a companion to the PBS film, this site documents the development of the birth control pill and its effect on women's health. The site offers a synopsis of the film (approximately 1,000 words) and about a dozen primary sources, including letters between birth control pill researchers. The site also includes a timeline that documents references to birth control as far back in history as Biblical Genesis.

A Gallery showcases approximately 15 birth control pill package designs. People and Events introduces visitors to the researchers (including Margaret Sanger) who dedicated years to the project, as well as milestones in the pill's development. Special Features uses a Flash presentation to demonstrate how the pill works to prevent pregnancy, explores the many shifts in sexual attitudes that have been attributed to the pill, and asks viewers to participate in an online poll.

A Teacher's Guide features lesson plans in geography, civics, history, and society, and presents challenging exercises for students. For example, one exercise asks students to survey the effect geography had on sexual attitudes by comparing laws about contraception from state to state in 1960.

Although the site is not a comprehensive archive, the primary sources and multimedia exhibits make it valuable, especially for research into birth control and women's issues.

Introduces an organization begun in 1996 that "creates social spaces for civic and academic conversations on working-class life and culture and its intersections with other identities and serves as a clearinghouse for information on working-class culture, issues, and pedagogy." The site presents information about the Center, its outreach programs and electronic discussion network; a 1,000-word essay defining working-class studies and commenting on recent trends; six course syllabi; online student exhibitions for a course on "Working in Youngstown," which deals with the history and representations of work in "Steeltown, U.S.A." and throughout the U.S.; 88 abstracts of papers presented at the 1999 conference on "Class, Identity, and Nation"; 84 partially annotated links to related resources, including 24 for museums on working-class and labor history; and a bibliography organized into 24 thematic categories such as "Working-Class Fiction," "Class as Culture," "Class Perception in the U.S.," and "Class and Sexuality." A useful site for introducing students to discussions of class and labor issues in American history.

This website presents all known correspondence of the wife of James Madison, containing roughly 2,000 letters. Although many letters are thank-you notes or polite responses to social invitations, others offer rich insights into the personality and experiences of the First Lady, especially those exchanged with her sisters. The letters are organized into five periods: birth and youth; the years as wife of the secretary of state; the years as first lady; retirement; and widowhood. Users can search by name, date, topic, or place. A table of contents lists the letters by date, author, and recipient.

Additional features include a biographical sketch; "Crosslinks" listing all names (including nicknames, middle, and maiden) appearing in each letter, in order of appearance; a different color font to highlight unclear or missing characters or words; and a summary of the contents of each letter. Although the site is gated, a free trial option is accessible to all.