Title varies: 1935, Complete catalogue of United States stamps, specialized.--1936-48, Catalogue of United States stamps, specialized.--1949-56, Scott's catalogue of United States stamps, specialized.
Imprint varies: Sidney, Ohio, 19--- . Vols. for 1973- issued in parts. NPM ed. 169, v. 2-6 (2013) gift from Dr. Courtney Shaw. npm copies for 2023 and 2024 purchased with funds from the S. Dillon ...