TY  - BOOK
AU  - Chrestenson,H.E.
TI  - Mappings of the plane: with applications to trigonometry and complex numbers 
T2  - A Series of books in mathematics
PY  - 1966///
CY  - San Francisco
PB  - W. H. Freeman
KW  - Trigonometrical functions
KW  - Geometry, Analytic
KW  - Plane
KW  - Numbers, Complex
ER  -