Mss.B.B61_W
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- Warburg, Aby: Photocopies from The Warburg Institute, London. 1895 Oct. 18
- Restriction: For photocopy permission, please contact American Philosophical Society Manuscripts Librarian. Copies received from the University of London, The Warburg Institute, August 1999.
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- Warburg, Aby: Photocopies from The Warburg Institute, London. 1896 Jul. 10
- Restriction: For photocopy permission, please contact American Philosophical Society Manuscripts Librarian. Copies received from the University of London, The Warburg Institute, August 1999.
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- Warburg, Aby: Photocopies from The Warburg Institute, London. 1927 Mar. 22
- Restriction: For photocopy permission, please contact American Philosophical Society Manuscripts Librarian. Copies received from the University of London, The Warburg Institute, August 1999.