Three to Conquer; The Space Merchants; Fifth Planet (Penguin Science Fiction Collection, Three Volumes)

A collection of three Penguin vintage Science  Fiction novels. Mass market paperbacks, in light card covers.  12mos.  Covers are a little toned and edge worn, mild reading creases to slightly sunned spines.  The Space Merchants has a cross penned on the front cover.  Internally all volumes show a hint of page toning else neat, clean and tight. The three books in this collection are (1) Three to Conquer by Eric Frank Russell (1963, first Penguin printing); The Space Merchants by Frederick Pohl and C M Kornbluth (1965, first Penguin printing); and Fifth Planet by Fred and Geoffrey Hoyle (1965, first Penguin printing).