Energy and vision
By: By S.P.Langley...
Published: 1891
Language: eng
Subjects: Color vision; Photometry
Notes: In National academy of sciences, Washington, D. C. Memoirs. Washington, 1891. 30 x 24 cm. v.5 (1st memoir) p. 7-18. diagrs. on 4 pl. (1 fold.)