Columbia subject headings:
Cascade Range.
Mountains--Recreational use--Washington (State)--Evaluation.
Natural history--Cascade Range.
Outdoor recreation--Washington (State)
Harvard subject headings:
Cascade Range.
Mountains--Washington (State)--Recreational use--Evaluation.
Outdoor recreation--Washington (State)
Princeton subject headings:
Cascade Range.
Mountains--Washington (State)--Recreational use--Evaluation.
Outdoor recreation--Washington (State).