TY  - BOOK
AU  - Wilson, Thomas D.
TI  - An introduction to chain indexing
SN  - 0208010696
U1  - 025.49 
PY  - 1971///]
CY  - [Hamden, Conn.]
PB  - Linnet Books
KW  - Chain indexing
KW  - Programmed instruction
N1  - Includes bibliographical references ( p. 84)
ER  -