TY  - BOOK
AU  - Bingham,Robert C.
TI  - Economic concepts : : a programmed approach / 
SN  - 0070826439
U1  - 371.3944 BIN 
PY  - 1975///
CY  - Toronto: 
PB  - McGraw-Hill Ryerson, 
KW  - Economics
KW  - Programmed instruction
ER  -