(BOOKS ON BOOKS) Two works on important collections of incunabula. Incunabula typographica. A Description Catalogue of the books printed in the Fifteenth Century (1460-1500) in the Library of Henry Walters. Baltimore: [The Walters Art Gallery], 1906. 4to, period-style full calf binding with raised fleur-de-lis shaped bands, gilt-lettered spine and upper board, t.e.g., others uncut. Bookseller's sticker to rear pastedown; otherwise fine. Library of Congress: Catalogue of the John Boyd Thacher Collection of Incunabula. Compiled by Frederick W. Ashley. Washington: Government Printing Office, 1915. 4to, quarter tan morocco over linen boards, gilt-lettered spine, t.e.g., others uncut.