TY  - BOOK
AU  - Sprague, Atherton H
TI  - Essentials of plane trigonometry and analytic geometry
U1  - SPR-E 
PY  - 1950///
CY  -  New York
PB  - Prentice-Hall of India Pvt. Ltd.
KW  - Trigonometry; Mathamatics
ER  -