Assertion: national park's land | /r/HasProperty | preserved
Facets:
Source sentences:
text: In the 1940s writer and researcher Olaus Murie proposed that Alaskan lands be preserved.
text: Then in the 1920's, John D. Rockefeller Jr. and his family visited the area, and he immediately realized that the land surrounding the Tetons needed to be protected just as much as the Teton Range itself.