TY  - BOOK
AU  - Ayres, Frank
TI  - Theory & Problems of Plane & Spherical Trigonometry: Theory & Problems of Plane & Spherical Trigonometry, New York : Schaum, 1954
U1  - 514.5 
PY  - 1954///
CY  - New York
PB  - Schaum
ER  -