1. Philadelphia Free Library , Logan Square, Philadelphia, Pennsylvania, U.S.A.
2. University of Pennsylvania , Biomedical Library, Johnson Pavillion, 36th and Hamilton Walk, Philadelphia. Pennsylvania, U.S.A.
3. EDWARD MARTIN 1859–1938
4. The University Archives , University of Pennsylvania, North Arcade, Franklin Field, Philadelphia, Pennsylvania 19194-6320, U.S.A.