TY  - BOOK
AU  - Bingham, Robert C
TI  - Economic concepts: a programmed approach. (6th ed.)
SN  - 0070449368
AV  - HB 171.5 Bin 
PY  - 1981///
CY  - New York
PB  - McGraw-Hill
KW  - ECONOMICS--PROGRAMMED INSTRUCTION
ER  -