Munch, Theodore W. What is heat / Theodore W. Munch ; Pictures-Gregory Orloff. - Chicago : Benefic Press, 1960. - 46 p. : ill. ; 21 cm. - The What is it series. . 301 301 LCCN: 60014442 Subjects--Topical Terms: Heat. Dewey Class. No.: 536 / M921w