Mystery & Thriller in 1980

The Sky-Liners by L'Amour, Louis

Sackett's Land by L'Amour, Louis

The Adventures of Tom Sawyer, Tom Sawyer Abroad, and Tom Sawyer, Detective: Volume 4 by Twain, Mark

Secrets by Smith, Michael A.

Tournament by Livesey, Herb, Hamlin, Ron

Legacy of the Lake by Smith, Michael A.

Andrew & Tobias by Stewart, J. I. M.