TY  - BOOK
AU  - National Reprographic Centre For Documentation
ED  - National Reprographic Centre For Documentation
TI  - Updatable microforms systems :  A state of the art survey
T2  - Occasional paper; 2
U1  - 20bM1495, L24 
PY  - 1972///
CY  - Hatfield
PB  - NRCD       
KW  - LIBRARY SCIENCE
ER  -