TY  - BOOK
AU  - Campbell,Howard E., x
AU  - x
TI  - Concepts of trigonometry: x
SN  - 0871502992
U1  - 516.24/C174c 
PY  - 1981///
CY  - Boston.
PB  - Weber and Schmidt.
KW  - Trigonometry
N1  - Includes
ER  -