"walsh, j w. "
textbook of illuminating engineering: / j.w. walsh - 2 ed. - uk : pitman 1954. - "xii, 202p.; 22 cm."
hard cover
--
621. 32 wal
textbook of illuminating engineering: / j.w. walsh - 2 ed. - uk : pitman 1954. - "xii, 202p.; 22 cm."
hard cover
--
621. 32 wal