TY  - BOOK
AU  - Harris,Charles Overton
ED  - American Technical Society.
TI  - Slide rule simplified,
AV  - QA73.H3 
U1  - 510.78 
PY  - 1943///
CY  - Chicago
PB  - American technical society
KW  - Slide-rule
N1  - "Answers to practical problems": p. 248-250
UR  - http://www.archive.org/details/sliderulesimplif00harr
UR  - http://www.openlibrary.org/books/OL6453706M
ER  -