TY  - BOOK
AU  - Bagg Thomas C.
AU  -  Stevens Mary Elizabeth.
TI  - Information selection systems retrieving replica copis :  A state-of-art report
T2  - National Bureau of Standards, Technological note; 157
U1  - 2:97, K11 (2D) 
PY  - 1961///
KW  - LIBRARY SCIENCE
ER  -