Tudalennau sy'n cysylltu â "Delwedd:Identified! (Vivian Leroy Crisler (1885-1953), an acoustics researcher at the National Bureau of Standards, Washington, D.C., looking over a loud speaker horn used in sound penetration tests) (LOC) (21890090555).jpg"
Appearance
Mae'r tudalennau isod yn cysylltu â Delwedd:Identified! (Vivian Leroy Crisler (1885-1953), an acoustics researcher at the National Bureau of Standards, Washington, D.C., looking over a loud speaker horn used in sound penetration tests) (LOC) (21890090555).jpg:
Ceir 1 eitem.
- Minden, Nebraska (cyswllt ffeil) (← dolenni | golygu)