TY  - BOOK
TI  - American Drafting Standard Manual ASA Y14.3-1957: Ssection 3 projections: American Society for ENgineering Education
U1  - 621.8508 Am38s 
PY  - 1957///
CY  - 
PB  - American Society of Mechanical Engineers
KW  - Drafting standards.Manuals -America
ER  -