TY  - BOOK
AU  - Ballou, Donald H.
AU  - Steen, Frederick H.
TI  - Plane and spherical trignometry
U1  - 516.05244 
PY  - 1943///
CY  - Boston
PB  - Ginn & Company
N1  - Donated by Prof. S. K. Chatterjee
ER  -