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- 21026189 alternative "Measurement of filter factors.".
- 21026189 contributor B616700.
- 21026189 created "1921.".
- 21026189 date "1921".
- 21026189 date "1921.".
- 21026189 dateCopyrighted "1921.".
- 21026189 extent "1 p. l., p. 79-89 incl. 1 illus., tables, diagr.".
- 21026189 issued "1921".
- 21026189 issued "1921.".
- 21026189 language "eng".
- 21026189 publisher "Washington, Govt. Print. Off.,".
- 21026189 subject "Photographic optics.".
- 21026189 subject "TR220 .D3".
- 21026189 title "A new method for the measurement of photographic filter factors, by Raymond Davis, photographic technologist, Bureau of Standards. February 5, 1921 ...".
- 21026189 type "text".