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- Allen, Lane & Scott 1 results
- Allen, Philip Meredith, 1893- 1 results
- Allen, R. H. (Richard Howe), 1821-1892 1 results
- Allen, Roger B. 1 results
- Allen, William 1 results
- Allinson, William J., 1810-1874 1 results
- Allott, Stephen 1 results
- Alotta, Robert I. 2 results
- Alsop, Gulielma Fell, 1881- 1 results
- Alspach, S. 1 results
- Alspaugh, H. P. 1 results
- Altemus, Eleanor Ward, 1917- 1 results
- Amateur Athletic Union of the United States 1 results
- Ambler Church of the Brethren (Ambler, Pa.) 1 results
- America Philosophical Society 1 results
- American Academy of Arts and Sciences 1 results
- American Antiquarian Society 1 results
- American Association of University Women Erie, Pennsylvania Branch 1 results
- American Association of University Women Philadelphia Branch 6 results
- American Association of University Women. Pennsylvania Division 1 results
- American Breweriana Association 1 results
- American Catholic Historical Society of Philadelphia 1 results
- American College of Clinical Pharmacology 1 results
- American Dredging Company 1 results
- American Institute of Architects Convention 1 results
- American Institute of Architects. Philadelphia Chapter 4 results
- American Institute of Electrical Engineers 1 results
- American Legion Thomas Roberts Reath Marine Post No. 186 (Philadelphia, Pa.) 1 results
- American Library Association Conference 1 results
- American Medical Association 1 results
- American Medical Association Meeting 1 results
- American Philosophical Society 16 results
- American Philosophical Society Committee on Education and Participation in Science 1 results
- American Philosophical Society. Library 1 results
- American Public Health Association Meeting 1 results
- American Revolution Bicentennial Commission 1 results
- American Society of Planning Officials Meeting 1 results
- Ames, Herman Vandenburg, 1865-1935 1 results
- Anders, James M. (James Meschter), 1854-1936 2 results
- Anderson, Jim, 1957- 1 results
- Anderson, John Alexander, 1829-1917 1 results
- Anderson, John, 1954 March 27- 1 results
- Anderson, Lisa, 1962- 1 results
- Anderson, Nancy 1 results
- Anthony J. Drexel Biddle Collection 1 results
- Anthracite Heritage Museum and Iron Furnace Associates 1 results
- Anthracite Heritage Museum and Iron Furnaces Associates 1 results
- Antosh, Lou, 1943?- 1 results
- Apollo Area Historical Society (Apollo, Pa.) 1 results
- Appalachian Mountain Club. Delaware Valley Chapter 1 results more…