This must not be! - Winsor McCay. LCCN2002705518, Winsor McCay, 2 May 1917

Title: this must not be! / winsor mccay. Abstract/medium: 1 print: offset photomechanical; sheet 35 x 24 cm, mount 38 x 26 cm. Genre: Cartoons. Date: 2 May 1917. Collection: Miscellaneous Items in High Demand, PPOC, Library of Congress.