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Holding institution
- University of Michigan114
- Library of Congress35
- Columbia University, Rare Book & Manuscript Library27
- Free Library of Philadelphia, Special Collections24
- Bodleian Libraries23
- British Library. India Office Records and Private Papers22
- Princeton University Library17
- University of Pennsylvania Libraries14
- Harvard University's Libraries and Museums11
- Cambridge University Library10
- Bryn Mawr College Libraries3
- Penn Museum3
- Haverford College2
- Consejo Superior de Investigaciones Científicas (CSIC)1