TY  - BOOK
AU  - Ruffin,Roy J.,1938-
AU  - Gregory, Paul R.
TI  - Principles of economics
SN  - 067346590X
AV  - HB171.5 .R82 1993
U1  - 330 22nd ed.
PY  - 1993///
CY  - New York
PB  - Harper Collins College Publishers
KW  - Economics
N1  - Includes bibliographical references and index
ER  -