Assertion: parallel rampart | /r/HasProperty | discovered on the moon's surface
Facets:
value: by gruithuysen
type: LOCATION
Source sentences:
text: They also undertook to examine the true nature of that system of parallel ramparts discovered on the moon's surface by Gruithuysen, a learned professor of Munich, who considered them to be "a system of fortifications thrown up by the Selenitic engineers.