Walsh, John W. T.
Textbook of illuminating engineering: intermediate grade / John W T Walsh - London : I. Pitman, c1954. - xii, 202 pages : illustrations 22 cm.
Includes index.
English.
Lighting.
621.32/WAT
Textbook of illuminating engineering: intermediate grade / John W T Walsh - London : I. Pitman, c1954. - xii, 202 pages : illustrations 22 cm.
Includes index.
English.
Lighting.
621.32/WAT