TY  - BOOK
AU  - Levens,A.S.
TI  - Graphics: analysis and conceptual design 
PY  - 1968///
CY  - New York
PB  - Wiley
KW  - Design, Industrial
KW  - Engineering graphics
N1  - First ed. published in 1962 under title: Graphics, with an introduction to conceptual design; Third ed. published in 1980 under title: Graphics in engineering design
ER  -