TY  - BOOK
AU  - Gies,Frances
AU  - Gies,Joseph
TI  - Cathedral, forge, and waterwheel: technology and invention in the Middle Ages 
SN  - 9780060165901
AV  - T 17 .G5 
PY  - 1994///
CY  - New York
PB  - HarperCollins Publishers
KW  - Technology
KW  - History
KW  - Inventions
KW  - Science, Medieval
N1  - Includes bibliographical references (p. [329]-343) and index
ER  -