TY  - BOOK
AU  - Chrestenson,H.E., x
AU  - x
TI  - Mappings of the plane: Applications to trigonometry and complex numbers
SN  - x
U1  - 514/CHM 
PY  - 1966///
CY  - San Francisco.
PB  - Freeman
KW  - Trigonometry
N1  - x
ER  -