TY  - BOOK
AU  - BLACKWOOD , OSWALID
TI  - INTRODUCTORY COLLEGE PHYSICS 
U1  - Pg173 
PY  - 1939///
KW  - PHYSICS
N1  - Pg mean Physics General & Mechanics Page 457-464 in A to Z Accession Register (Acc. No. Pg1-Pg228) & Page 640 (Acc. No. 224-231)
ER  -