TY  - BOOK
TI  - Educational supplies catalogue : : chemistry, physics, technology, environmental science, biology, audio-visual aids 
U1  - 016.37133 
PY  - 1983///
CY  - West Germany: 
PB  - MBM  Lehrmittel and Verlage, 
KW  - Audiovisual materials-Catalogues
KW  - Educational materials-Catalogues
ER  -