Columbia subject headings:
Harvard subject headings:
Campbell, Clyde, 1885-1930--Correspondence.
Campbell, Myrle--Correspondence.
Farm life--Peace River Valley (B.C. and Alta.)--History--20th century.
Frontier and pioneer life--Peace River Valley (B.C. and Alta.)
Peace River Valley (B.C. and Alta.)--Social life and customs.
Pioneers--Peace River Valley (B.C. and Alta.)--Correspondence.
Princeton subject headings:
Campbell, Clyde Eldrage, 1885-1930.
Campbell, Myrle.
Frontier and pioneer life--Alberta--Peace River District.
Peace River Region (Alta.)--History--Sources.