TY  - BOOK
AU  - Keen,Martin L.
AU  - Kramer,Dick
TI  - How it works, volume 2,
SN  - 0448116111 (trade ed.)
PY  - 1974///]
CY  - New York
PB  - Grosset & Dunlap
KW  - Technology
KW  - Juvenile literature
UR  - http://www.archive.org/details/howitworksvolume02keen
UR  - http://www.openlibrary.org/books/OL24603449M
ER  -