TY  - BOOK
AU  - Henderson,J.Vernon
AU  - Poole,William
TI  - Principles of economics: student workbook 
SN  - 0669144916
AV  - HB171.5 .H46 1991
PY  - 1991///
CY  - Lexington
PB  - D. C. Heath
KW  - Economics
ER  -