Keen, Martin L. How it works, volume 2, [electronic resource] / by Martin L. Keen. Illustrated by Dick Kramer.. — New York, : Grosset & Dunlap, [1974]. — 221 p. : illus. (part col.) 29 cm.



ISBN: 0448116111 (trade ed.) 9780448116112 (trade ed.) 0448132044 (library ed.) 9780448132044 (library ed.)

Subjects--Topical Terms:
Technology.
Technology--Juvenile literature.