UNITED STATES – Lane, Maryette B. / Perry, Elliott: The Harry F. Allen Collection of Black Jacks. A Study of the Stamp and Its Use (1969), 148 pages, hardcover; PLUS: Frajola, Richard C. / Mayer, Frederick R.: The United States Five Cent Stamp of 1856. The Frederick R. Mayer Collection (2005), 165 pages, hardcover, signed by both authors; PLUS: Laurence, Robert: The George Walcott Collection of used Civil War patriotic covers (1934), a kind of catalogue (261 pages and 3.253 lots) with separate prices realized, hardcover: all items in good condition for the age. Estimate: 160 Euro