Heather McDaniel became the first female to referee men's professional hockey when she worked her first game under contract with the Central Hockey League on October 21, 1995.
http://espn.go.com/espnw/news-opinion/6849824/calling-shots-refereeing-highest-level-long-shot-nhl
In general, National Hockey League Referees earn anywhere between 110,000 and 255,000 dollars.
National Hockey League was created on 1917-11-26.
National Women's Hockey League was created in 1999.
The American Hockey League. (AHL)
Uruguayan National Roller Hockey League was created in 2008.
English National Ice Hockey League was created in 1996.
It is a league that has many different branches, theres a junior league, western hockey league, and so on, but the main league is the national hockey league which is composed of 30 teams.
An official National Hockey League puck is 3 inches in diameter, and 1 inch thick.
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Hockey i.e National Hockey League
National Hockey League
National Hockey League Players' Association was created in 1967-06.