LEY, WILLY. Group of 5 Typed Letters Signed to Herbert Schaefer, each on a postcard. Topics include Ley's Mars book publication set for March 1950,

LEY, WILLY.Group of 5 Typed Letters Signed to Herbert Schaefer, each on a postcard. Topics include Ley's Mars book publication set for March 1950, scientific meeting schedules, plans to review a Robert Goddard book, and scientific/mathematical related questions. Each approximately 3x5 inches. Montvale, N.J., January-May 1949.