Air Mail Pioneers U.S. Air Mail Service Pioneers aviation history articles. Airmail milestones early pilots. Photographs of antique airplanes. Post Office ran mail 1919-1927. Commercial airlines worldwide origins. http://www.airmailpioneers.org/

Lewis and Clark Bicentennial Council Commemorating the legacy of the Lewis and Clark expedition of 1803-1806. http://www.lewisandclark200.org/

Lewis and Clark Trail Heritage Foundation The Foundation's mission is to honor the remarkable historic legacy of Lewis and Clark through research, education, preservation, promotion, and coordination. http://www.lewisandclark.org/

American Historical Association The professional organization for all historians. http://www.theaha.org/

American Jewish Historical Society The organization is interested in history of American Jews. http://www.ajhs.org/

Archivists for Congregations of Women Religious ACWR - a roundtable of the Society of American Archivists, was created to address the specialized needs of religious archives. http://www.homestead.com/acwr/

National Women's History Project Regarded as "the clearinghouse" for U.S. women's history information and resources, the NWHP site provides excellent links to biography-rich sites for student researchers, program ideas for all constituencies, a downloadable "Test Your Women's History I.Q." quiz sheet, and other delights. http://www.NWHP.org/

Heritage Preservation Association Organization acting to protect and preserve the symbols, culture and heritage of the American South. http://www.hpa.org/

Constitution Society Comprehensive collection of constitutional materials, including books, articles, and tools. http://www.constitution.org/

American Association of the History of Medicine An academic society devoted to the history of medicine and all aspects of health. http://www.histmed.org/

Army Historical Foundation Dedicated to the promotion and preservation of the history and traditions of the American soldier. http://Armyhistoryfnd.org

US Corps of Topographical Engineers History and techniques of the Corps, emphasizing the Mexican War, western expansion and the Civil War. http://www.topogs.org

The Jefferson Legacy Foundation A non-profit, non-partisan organization which promotes education about Thomas Jefferson through film, web, library, outreach, and numerous support programs. http://jeffersonlegacy.org/

American Association for State and Local History Provides leadership, service and support for the preservation and interpretation of American state and local history. http://www.aaslh.org/

Living History Farms A non-profit, historical, educational foundation located in Urbandale, Iowa, USA. http://www.lhf.org/

Labor and Working Class History Association An organization of scholars, union members, students, and citizens promoting a wider understanding of the history of working class people, their communities, and their organizations in the United States. http://www.lawcha.org/

American Printing History Association Founded in 1974 to encourage the study of printing history and its related arts and skills, including calligraphy, typefounding, typography, papermaking, bookbinding, illustration, and publishing. http://printinghistory.org/

American Antiquarian Society An independent research library focusing on American history, literature, and culture through 1876. http://www.americanantiquarian.org/

The Gilder Lehrman Institute of American History The Gilder Lehrman Institute of American History promotes interest in history through lectures, exhibitions, teacher seminars, prizes and fellowships, and electronic resources including an online historical textbook and annotated historical documents. http://www.gliah.uh.edu/index.cfm

Maryland Association of History Museums An alliance of historical, cultural, and educational institutions created to speak for and to enhance the professionalism and effectiveness of all organizations that collect, hold, interpret and protect the cultural and material heritage of the State. http://www.mahm.org/general.htm