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1
Critical thinking / Richard L. Epstein; illustrated by Alex Raffi.
Belmont, CA : Wadsworth Pub. Co., 1999.
424 p. : ill. ; 24cm.
2
Workbook for critical thinking / Richard L. Epstein, cartoons by Alex Raffi.
Belmont, Calif. : Wadsworth Pub. Co., 1999.
372, [2] p. : ill. ; 28 cm.