1 "Fișier:Water_filtration_works._(IA_waterfiltrationw00fuer).pdf".

Fișier:Water filtration works. (IA waterfiltrationw00fuer).pdf

for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Water_filtration_works._(IA_waterfiltrationw00fuer).pdf...