TY  - BOOK
ED  - National Geographic Society, Washington, D. C.
TI  - How things are made
SN  - 0870443348
PY  - 1981///
CY  - [Washington, D.C.]
PB  - National Geographic Society
KW  - Manufactures
KW  - Manufacturing processes
N1  - Prepared by the Special Publications and School Services Division; writers: Arnold B. Ajello, and others; illustrations: Barbara Gibson
ER  -