The full text of the History of the New York Public Library, Astor, Lenox and Tilden Foundations is available to download through the NYPL Catalog, or to view in the NYPL Digital Collections platform (also available to view as a book). Individual chapters were previously published as the Bulletin of the New York Public Library and are available through the Internet Archive.
Additional information on the history of The New York Public Library and its founders can be located through searching the NYPL Classic Catalog for the subjects New York Public Library -- History, New York Public Library, Astor Library, Lenox Library, Tilden Trust, Astor, John Jacob, 1763-1848, Lenox, James, 1800-1880, and Tilden, Samuel J. (Samuel Jones), 1814-1886.
Further materials on Lydenberg and Billings can be found through the subjects Lydenberg, Harry Miller, 1874-1960 and Billings, John S. (John Shaw), 1838-1913.
For 20th century guides to the NYPL research collections, you may refer to Karl Brown's A guide to the reference collections of the New York Public Library and Sam Williams' Guide to the research collections of the New York Public Library.
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