Columbia subject headings:
Big Delta (Alaska)--Maps.
Geology--Alaska--Big Delta--Maps.
Geology--Alaska--Goodpaster River Watershed--Maps.
Geology--Alaska--Maps.
Goodpaster River Watershed (Alaska)--Maps.
Maps.
Topographic maps.
Harvard subject headings:
Big Delta (Alaska)--Maps.
Geology--Alaska--Maps.
Princeton subject headings: