Columbia subject headings:
Lakes--Recreational use--United States.
Outdoor recreation--Environmental aspects--United States.
Outdoor recreation--United States.
Harvard subject headings:
Lakes--Recreational use--United States.
Lakes--United States--Recreational use.
Outdoor recreation--Environmental aspects--United States.
Outdoor recreation--United States
Princeton subject headings:
Lakes--United States x Recreational use.
Outdoor recreation--Environmental aspects--United States.
Outdoor recreation--United States.