TY  - BOOK
AU  - Levens,A.S.
AU  - Edstrom,A.E.
TI  - Problems in mechanical drawing
AV  - T353 .L
U1  - 604.2 22
PY  - 1950///
CY  - New York
PB  - McGraw-Hill Book co.
KW  - Mechanical drawing
ER  -