Cover Artist & Illustrators of Andre Norton's English titles
Roberts, Tony
The Crossroads of Time ~ Gollancz, 1976, hc, UK
Plague Ship ~ Magnet, 1979, pb, UK
Postmarked the Stars ~ Magnet, 1980, pb, UK
Sargasso of Space ~ Magnet, 1979, pb, UK
https://andre-norton.com/special-sections/cover-artist/908-roberts-tony#sigProIdf661e60532