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The American Historical Association
As the largest historical society in the United States, the AHA provides leadership and advocacy for the profession, fights to ensure academic freedom, monitors professional standards, spearheads essential research in the field, and provides resources and services to help its members succeed. Founded in 1884, the AHA serves more than 14,000 history professionals, representing every historical period and geographical area.

The Athenæum of Philadelphia
The Athenæum is a member supported, not-for-profit, special collections library founded in 1814 to collect materials "connected with the history and antiquities of America, and the useful arts, and generally to disseminate useful knowledge" for public benefit. Annually the Athenæum's nationally significant collections attract thousands of readers: graduate students and senior scholars, architects, interior designers, museum curators, and private owners of historic buildings.

The Atwater Kent Museum of Philadelphia
The Atwater Kent Museum, located just around the corner from Independence Hall and the Liberty Bell (at 15 South 7th Street), is the gateway to Philadelphia history. The museum is open for general admission Wednesday-Sunday from 1-5pm. Founded over 60 years ago as the city's history museum, the Atwater Kent Museum of Philadelphia (AKMP) provides many ways to learn about the city. School and youth groups use hands-on experiences with historical objects. Families discover the city together. Adults find expertise about their collecting interests and historical issues. National and international visitors gain insight into 21st-century urban life and context for important moments in American history.

The Greater Philadelphia Cultural Alliance
The Greater Philadelphia Cultural Alliance?s many tasks include advocating for positive public sector, business and foundation policies and funding priorities at the local, state, and federal levels on behalf of its members. It also conducts the ?Campaign for Culture,? an umbrella marketing campaign for the cultural industry designed to increased awareness and attendance at Greater Philadelphia cultural institutions. The Alliance was formed in 1972 and now boasts a membership of over 300 non-profit arts and culture organizations.

The Historical Society of Pennsylvania
Founded in 1824 in Philadelphia, The Historical Society of Pennsylvania is one of the oldest historical societies in the United States and holds many national treasures. The Society's building, listed on the City of Philadelphia's Register of Historical Places, houses some 600,000 printed items and over 19 million manuscript and graphic items.

The Independence Hall Association
The Independence Hall Association (IHA) was founded in 1942 to spearhead the creation of Independence National Historical Park. They stand as an independent group of private concerned citizens overseeing and being consulted on matters concerning the Park. IHA helped in the effort to reconstruct the Declaration House; donated the statue of the Signer; and encouraged development of guidebooks for Philadelphia. IHA operates the website ushistory.org, which supports their mission to educate the public about the Revolutionary and Colonial eras of American history, as well as Philadelphia generally.

The Library Company
The Library Company of Philadelphia is a non-profit independent research library with collections documenting every aspect of the history and background of American culture from the colonial period to the end of the nineteenth century. A collection of national importance, its holdings number approximately half a million printed volumes in a wide variety of formats; 75,000 graphics; 160,000 manuscripts; and a small, distinguished collection of early American art and artifacts.

The National Constitution Center
The National Constitution Center in Philadelphia focuses on the Constitution as both a historical and a living document. It is dedicated to honoring and explaining the U.S. Constitution through interactive and multimedia exhibits, photographs, film, sculpture, text, and artifacts.

The National Park Service
The National Park Service preserves unimpaired the natural and cultural resources and values of the national park system for the enjoyment, education, and inspiration of this and future generations. The Park Service cooperates with partners to extend the benefits of natural and cultural resource conservation and outdoor recreation throughout this country and the world.

The Navy Yard
The Navy Yard is a 1,200-acre development located along 7 miles of historic waterfront at the confluence of the Schuylkill and Delaware Rivers. The web site includes historic information on shipbuilding from its earliest days as League Island to its closure in 1996.

The Pennsylvania Historical and Museum Commission
As the official agency of the Commonwealth for the conservation of Pennsylvania?s historic heritage, the powers and duties of the Commission fall into these principal fields: care of historical manuscripts, public records, and objects of historic interest; museums; archaeology; publications; historic sites and properties; historic preservation; geographic names; and the promotion of public interest in Pennsylvania history. The Commission includes oversight of the Pennsylvania State Archives, a major repository for official historical records of state government and other manuscripts and materials.

Philadelphia Area Consortium of Special Collections Libraries
The Philadelphia Area Consortium of Special Collections Libraries (PACSCL) encourages diverse audiences to explore and engage with member libraries' uniquely rich holdings and, through collaboration, strengthens these collections and the institutions that preserve them. PACSCL is the most extensive and diverse collaboration among a region's libraries and archives in the United States. Its collections, in their depth and variety, comprise an internationally important body of unique and rare materials for students, scholars, and life-long learners of every background.

PhillySkyline.com
PhillySkyline.com offers a contemporary look into Philadelphia's landmarks and neighborhoods. Website author R. Bradley Maule presents a personal and photographic look at the buildings that mark Philadelphia's skyline and the neighborhoods that surround it. Local photographers contribute photo essays on topics ranging from the Mummers Parade to City Snows to the Philadelphia Zoo. Updated frequently, PhillySkyline.com combines current interests with historic information and beautiful images.

The Society of American Archivists
Founded in 1936, the Society of American Archivists includes approximately 3,100 individual and 500 institutional members. It serves the educational and informational needs of its members and provides leadership to help ensure the identification, preservation, and use of the nation's historical record.