![Dr. W.W. Coblentz, Bureau [of] Standards, 25.01.21](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTUvMTEvMjUvZHItd3ctY29ibGVudHotYnVyZWF1LW9mLXN0YW5kYXJkcy0xMjUyMS0xMDI0LmpwZw%3D%3D/320/248/jpg "Dr. W.W. Coblentz, Bureau [of] Standards, 25.01.21")
Dr. W.W. Coblentz, Bureau [of] Standards, 25.01.21
Zusammenfassung
Public domain historical photo, free to use, no copyright restrictions image - Picryl description
Datum
1921
Quelle
Library of Congress
Copyright-info
No known restrictions on publication.
