TY  - GEN
AU  - Spencer, William George
TI  - Inventional Geometry : a series of problems, intended to familiarize the pupil with geometrical conceptions, and to exercise his inventive faculty 
SN  - 9780371256435
U1  - 513 
PY  - 2019///
CY  - Miami
PB  - Hardpress Publishing
ER  -