TY  - BOOK
AU  - Welfling,Weldon
TI  - Principles of economics
SN  - 0070691851
AV  - HB171 .W38
U1  - 330 
PY  - 1971///]
CY  - New York
PB  - McGraw-Hill
KW  - Economics
KW  - Local
N1  - Includes bibliographical references
ER  -