TY  - BOOK
AU  - Raygor,Alton Lamon
AU  - Wark,David M.
AU  - Raygor,Robin D.
TI  - Systems for study
SN  - 0070444196 :
U1  - 378.1  RAY 
PY  - 1980///
CY  - New York
PB  - McGraw-Hill
ER  -