AU  - Crapo,Henry H.
AU  - Rota, Gain-Carlo.
TI  - On the foundations of combinatorial theory : : Combinatorial Geometries / 
SN  - 0262530163
U1  - 514.5 
PY  - 1970///
CY  - Cambridge : 
PB  - The MIT Press , 
KW  - Plane Trignometry
KW  - Combinatorial Theory
ER  -