operating
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This parabolic mirror system is part of the solar furnace operated for the U.S. Army..., 04/1974.
by U.S. National Archives
by U.S. National Archives
No known copyright restrictions(著作権制限なし)

Women volunteers operating knitting machines (taken for Australian Comforts Fund), by Sam Hood March 1944
by State Library of NSW
by State Library of NSW
No known copyright restrictions(著作権制限なし)

Irrigating an alfalfa field on an experimental farm operated by EPA's Las Vegas National Research Center, May 1972
by U.S. National Archives
by U.S. National Archives
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
1,561件~1,620件 (全 87,464件)
























































