Scientific men and their duties : the president's address before the Philosophical Society of Washington, December 4, 1886 / by John S. Billings.
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Scientific men and their duties : the president's address before the Philosophical Society of Washington, December 4, 1886 / by John S. Billings. Credit: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.. Public Domain Mark