1967 NHL ExpansionFrom six teams to 31: History of NHL From six teams to 31: History of NHL NHL Expansion and Relocation, 1942 From six teams to 31: History of NHL The Original Six | Parkway Youth HockeyNHL Expansion and Relocation, 1942 1943-67 NHL - The Expansion Years (1968-1979 From six teams to 31: History of NHL 1967 NHL expansion - WikipediaNHL expansion from Original 6 to SeattleNational Hockey League. “Original Six NHL Expansion Clubs from the Original NHL National Hockey League. The start of History of the National Hockey League Hockey's Original 6 – Greystone Books Ltd.
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