TY  - BOOK
AU  - Hopkinson, Ralph Galbraith
TI  - ARCHITECTURAL PHYSICS
U1  - 729.2 
PY  - 1963///
CY  - London
PB  - H. M. Stationery Off.
KW  - Lighting
N1  - At Head Of Title : Dept. Of Scientific And Industrial Research. Building Research Station
ER  -