TY  - BOOK
AU  - Prosveta, N. 
TI  - Chemistry: : A textbook for the 9th class of the English- language General-Educational Polytechnical schools
AV  - QD 11 .P7 1974 
PY  - 1974///
CY  - Sofia
PB  - Narodina Prosveta 
KW  - Chemistry -
KW  - Problems,
KW  - Exercises, etc
ER  -