BOOK Robert A. Heinlein 'Double Star' (1964) PB science fiction

AUTHOR: Robert A. Heinlein
TITLE: Double Star
PUBLISHER: Signet
YEAR: 1964 (third printing; orig. pub date 1957)
FORMAT: paperback
CONDITION: good.  Solid cover and pages, light tanning.

Shipping weight 8 ounces.