Author
"Old Northwest" Genealogical Society
1
"Plast" orhanizat︠s︡ii︠a︡ ukraïnsʹkoï molodi
2
1727 Society of Old First Reformed Church, United Church of Christ (Philadelphia, Pa.)
1
1745 Association and National Military History Society
1
2101 Cooperative (Philadelphia, Pa.)
1
ABC-Clio Information Services
1
ACEN (Organization)
1
AIDS Fund (Philadelphia, Pa.)
2
AIDS Information Network (Philadelphia, Pa.)
2
AIM, Inc. (Glendale, Calif.)
1
ALS Association Greater Philadelphia Chapter
1
ATLATL (Organization)
1
Aaron Burr Association
1
Abbott, Lyman, 1835-1922
1
Aborigines Protection Society (Great Britain)
1
Academy House (Philadelphia, Pa.)
1
Academy of Certified Archivists
1
Academy of Natural Sciences of Philadelphia
2
Académie canadienne-française
2
Académie des lettres du Québec
2
Académie royale des sciences, des lettres et des beaux-arts de Belgique. Classe des sciences
1
Accademia di Paestum
2
Ackermann, Rudolph, 1764-1834
1
ActionAIDS (Philadelphia, Pa. : Organization)
2
Acton, Alfred
1
Aczel, Aurel
1
Aczél, Aurél
1
Adam, Antoinette, 1905-
1
Adamic, Louis, 1899-1951
2
Adams, George Burton, 1851-1925
1
Addison, Joseph, 1672-1719
1
Adler, Cyrus, 1863-1940
1
Adler, Elmer, 1884-1962
2
African American Museum in Philadelphia
1
African People's Socialist Party
2
Afro-American Historical and Cultural Museum (Philadelphia, Pa.)
1
Afro-American Historical and Genealogical Society (Washington, D.C.)
2
Afro-American Research Institute (New York, N.Y.)
2
Agricultural History Society
1
Agudat Iḥud (Israel)
2
Agudath Israel of America
1
Alberta Native Communications Society
2
Alcott, William A. 1798-1859
1
Aldanov, Mark Aleksandrovich, 1886-1957,
2
Alden Park (Philadelphia, Pa. : Apartment houses)
1
Alden, Henry Mills, 1836-1919,
2
Alden, Timothy, 1771-1839
2
Alexe, Gheorghe
2
Allaben, Frank
1
Allegheny College (Meadville, Pa.)
1
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