TY  - BOOK
AU  - Kells, Lyman M.
AU  - Kern, Willis F.
AU  - Bland, James R.
TI  - Plane and spherical trigonometry
U1  - 514 
PY  - 1940///
CY  - New York
PB  - McGraw-Hill
KW  - Trigonometry
ER  -