Assertion: american bullfrog | /r/AtLocation | the pacific northwest
Facets:
value: in the late 1920s
type: TEMPORAL
value: as a food source
type: PURPOSE
value: in early 1930s
type: TEMPORAL
Source sentences:
text: The American Bullfrog was introduced to the Pacific Northwest in the late 1920s or early 1930s as a food source.