TY  - BOOK
AU  - LEVENS, A. S
TI  - Problems in mechanical drawing : first course
U1  - 744.422 L52P 
PY  - 1957///
PB  - N.Y.
KW  - MECHANICAL DRAWING -- PROBLEMS, EXERCISES, ETC
KW  - MECHANICAL DRAWING -- PROBLEMS, EXERCISES
ER  -