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Series
7 books in the catalogue

Book 1
Sargasso of Space
Andre Norton

Book 2
Plague Ship
Andre Norton

Book 3
Voodoo Planet
Andre Norton

Book 4
Postmarked the Stars
Andre Norton

Book 6
Derelict for Trade
Andre Norton, Sherwood Smith

Book 7
Moon Called
Andre Norton

A mind for trade
Andre Norton, Sherwood Smith
Book data and covers from Open Library (openlibrary.org).