TY  - BOOK
AU  - HATFIELD, H. STAFFORD 
TI  - INVENTIONS AND THEIR USES IN SCIENCE TODAY
U1  - RS33 
PY  - 1939///
CY  - NEW YORK 
PB  - PENGUIN BOOKS LIMITED
KW  - Reading Circle
N1  - Rs mean Reading Circle Page 1250-1275 in A-Z Register (Acc. No. Rs1-Rs717)
ER  -