TY  - BOOK
AU  - J S Gupta, 
TI  - P C Ray
U1  - 540.92 
PY  - 1900///
CY  - New Delhi
PB  - National Book Trust
KW  - General Stack
KW  - Natural Science & mathematics
KW  - Chemistry & allied science
KW  - Chemistry & allied scienceHistorical, geographical & persons treatmentGeneralia
ER  -