TY  - BOOK
AU  - Mason,Robert Deward
TI  - Programmed learning aid for business and economic statistics
T2  - Irwin programmed learning aid series; Irwin plaid series
SN  - 0256001197
U1  - 519.077 
PY  - 1978///
CY  - Homewood, Ill.
PB  - Learning Systems Co.
KW  - Statistics
KW  - Programmed instruction
N1  - Includes index
ER  -