Columbia subject headings:
Rafting (Sports)--Youghiogheny River.
Stream conservation--Youghiogheny River.
Youghiogheny River Valley.
Youghiogheny River.
Harvard subject headings:
Rafting (Sports)--Youghiogheny River.
Stream conservation--Youghiogheny River.
Youghiogheny River Valley.
Youghiogheny River.
Princeton subject headings: