Wijeratna, D.G.D.C.
Towards efficiency in lighting : the technology and consumer economics - [Colombo] [Ceylon Electricity Board] - 13 p.
ELECTRIC POWER DISTRIBUTION
ELECTRIC LIGHTING
621.31(548.7) / W5
Towards efficiency in lighting : the technology and consumer economics - [Colombo] [Ceylon Electricity Board] - 13 p.
ELECTRIC POWER DISTRIBUTION
ELECTRIC LIGHTING
621.31(548.7) / W5