Reprocessed Lunar Orbiter 4 image cropped in Gimp to show Drygalski crater and surrounding terrain. The original image is in the public domain because it is a work of the U.S. Government (NASA).
Immediate source: Lunar and Planetary Institute, Lunar Orbiter Photo Gallery Lunar Orbiter 4, image 193, h1 [1]
{{Information |Description = [[Drygalski (crater)]], on the moon. |Source = Reprocessed [[Lunar Orbiter 4]] image cropped in Gimp to show Drygalski crater and surrounding terrain.<br>The original image is in the public domain because it is a work of th...