Light and sound /
Nelkon, Michael.
Light and sound / Michael Nelkon. - 2nd ed. - London : Heinemann, 1955 [Reprinted 1958] - vii, 364p. : illus.; 22 cm.
Light.
Sound.
535 / NEL 1958
Light and sound / Michael Nelkon. - 2nd ed. - London : Heinemann, 1955 [Reprinted 1958] - vii, 364p. : illus.; 22 cm.
Light.
Sound.
535 / NEL 1958