Across the Space Frontier - circumlunar trip
Across the Space Frontier, Joseph Kaplan, Wernher von Braun, Heinz Haber, Willy Ley, Oscar Schatchter, Fred Whipple, edited by Cornelius Ryan, Viking Press, 1952. part of a prose exposition and elaboration of von Braun’s The Mars Project, the technical appendix of Project Mars,
Von Braun describes a lunar excursion, to be undertaken as a way to ease into interplanetary travel, and map the landing site for a lunar expedition.