TY  - BOOK
AU  - Betterley,Melvin L.
TI  - Sheet metal drafting
SN  - 0070051267
AV  - TS250 .B4 1978
U1  - 604/.2/671 
PY  - 1978///
CY  - New York
PB  - Gregg Division, McGraw-Hill
KW  - Sheet-metal work
KW  - Patternmaking
KW  - Mechanical drawing
N1  - Includes index
ER  -