TY  - BOOK
AU  - Orth,H.D.
TI  - Theory and practice of engineering drawing
AV  - T353 .O68 1959
U1  - 604.2 
PY  - 1959///]
CY  - Dubuque, Iowa
PB  - W. C. Brown Co.
KW  - Mechanical drawing
N1  - Published in 1946 under title: Basic engineering drawing
ER  -