Books by Emma Treadwell Thacher:
Books in the extended shelves:
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Thacher, Emma Treadwell: John Boyd Thacher collection of incunabula. (Government Printing Office, 1915), also by John Boyd Thacher, Frederick William Ashley, Library of Congress. Division of Acessions, and Library of Congress. Acquisitions Department (page images at HathiTrust)
Find more by Emma Treadwell Thacher at your library, or elsewhere.