TY  - BOOK
AU  - Heylings M.R 
TI  -  Graded Examples in Mathematics: Geometry and Trigonometry
SN  - 0721723314
U1  - 516 HEY DC20
PY  - 1994///
CY  - Scaborough
PB  - Schofield and sims LTD
ER  -