The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [3]
The Pratt & Whitney-Allison 578–DX geared propfan demonstrator engine, installed on an MD-80 testbed aircraft in April/May 1989. Author/source/URL: {{cite report |title=Quiet cruise efficient short take-off and landing subsonic transport system |url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20080015836.pdf |series=NASA/CR |volume=2008-215141 |given=Ron |surname=Kawai |publication-date=April 2008 |at=Figure 4. Ultra-high bypass ratio propulsors designed, built, and flight tested...
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