Books by John Gerard Heckscher:
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Heckscher, John Gerard, contrib.: Catalogue of the Library of the Late John Gerard Heckscher (3 volumes in 1; Albany: The Argus Co., 1909) (page images at HathiTrust)
Additional books by John Gerard Heckscher in the extended shelves:
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Heckscher, John Gerard: Duplicates from the library of Mr. John G. Heckscher (Taylor, 1906) (page images at HathiTrust)
Find more by John Gerard Heckscher at your library, or elsewhere.