TY  - BOOK
AU  - Downing,Douglas
TI  - Trigonometry the easy way
SN  - 0812043899
AV  - MATH QA531.D683 
PY  - 1990///
CY  - New York
PB  - Barron's Educational Series, Inc.
KW  - Trigonometry
N1  - Includes index
ER  -