Books by Jr. Collection of Telegraph History Robert Dalton Harris:
Books in the extended shelves:
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Robert Dalton Harris, Jr. Collection of Telegraph History: The history and progress of the electric telegraph, with descriptions of some of the apparatus (Lockwood & Co., 1872), also by Robert Sabine and Pa.). Library Franklin Institute (Philadelphia, contrib. by Pa) International Electrical Exhibition (1884 : Philadelphia (page images at HathiTrust)- Robert Dalton Harris, Jr. Collection of Telegraph History: The law of electric wires in streets and highways (Callaghan, 1892), also by Edward Q. Keasbey (page images at HathiTrust)
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