A century of light
By: by Walton Clark
Contributors: New Century Club (Philadelphia, Pa.)
Edition: 2d ed. September 1917.
Publisher: publisher not identified
Published: 1917
Place of publication: Place of publication not identified]
Language: eng
Number of pages: 46
Subjects: Lighting; History
Notes: "An address delivered before the New Century Club of Philadelphia, November 1915."

"Authorities": p. 45-46