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As ranch manager, Humphreys supervised the operation of some 165,000 acres and 113 windmills in King and adjacent Dickens counties. According to the ranch website, Pitchfork cowboys are known for the quality of their [[horse]]s, such as the  "Pitchfork Gray," a gray horse with a black mane and tail. The Pitchfork brand is of course in the shape of a pitchfork. The Pitchfork is a diversified agricultural business, with an annex in Jefferson County in southeastern [[Oklahoma]]. There have been major [[petroleum]] finds in the Tannehill sands area. The Pitchfork offers guided [[hunting]] for [[deer]], game birds, [[boar]], and other game. Farming has been expanded in recent years to increase winter grazing and grain production. The ranch has some 4,500 mother cattle.<ref>{{cite web|url=http://www.thepitchforkranch.com/ranch.html Pitchfork Ranch|title=Pitchfork Ranch|publisher=The Pitchfork Ranch|accessdate=November 19, 2019}}</ref>

As ranch manager, Humphreys supervised the operation of some 165,000 acres and 113 windmills in King and adjacent Dickens counties. According to the ranch website, Pitchfork cowboys are known for the quality of their [[horse]]s, such as the  "Pitchfork Gray," a gray horse with a black mane and tail. The Pitchfork brand is of course in the shape of a pitchfork. The Pitchfork is a diversified agricultural business, with an annex in Jefferson County in southeastern [[Oklahoma]]. There have been major [[petroleum]] finds in the Tannehill sands area. The Pitchfork offers guided [[hunting]] for [[deer]], game birds, [[boar]], and other game. Farming has been expanded in recent years to increase winter grazing and grain production. The ranch has some 4,500 mother cattle.<ref>{{cite web|url=http://www.thepitchforkranch.com/ranch.html Pitchfork Ranch|title=Pitchfork Ranch|publisher=The Pitchfork Ranch|accessdate=November 19, 2019}}</ref>

Humphreys served on the board of directors of the Texas and Southwestern Cattle Raisers Association and the National Cattleman's Association. He was similarly active in the [[Amarillo]]-based American Quarter Horse Association, having served on the association's public information and education committee.<ref>{{cit{{cite web|url=http://www.aqha.com/news/06142007_humphreys.html|title=AQHA Mourns Loss Of Jim Humphreys|publisher=American Quarter Horse Association|date=June 14, 2007|accessdate=November 19, 2019}}</ref><ref name=find/> From 1977 to 1980, Humphreys was the board chairman of the Ranching Heritage Center, which operates a highly acclaimed outdoor museum of western and ranch structures on the Texas Tech campus, open free to the public. In 2005, Humphreys, along with Giles Connell McCrary, Jr. (1919-2011) of Post in Garza County, was among five individuals presented with the Ranching Heritage Association "Founders Award."​<ref name=books/>

Humphreys served on the board of directors of the Texas and Southwestern Cattle Raisers Association and the National Cattleman's Association. He was similarly active in the [[Amarillo]]-based American Quarter Horse Association, having served on the association's public information and education committee.<ref>{{cite web|url=http://www.aqha.com/news/06142007_humphreys.html|title=AQHA Mourns Loss Of Jim Humphreys|publisher=American Quarter Horse Association|date=June 14, 2007|accessdate=June 20, 2007; no longer on-line.}}</ref><ref name=find/> From 1977 to 1980, Humphreys was the board chairman of the Ranching Heritage Center, which operates a highly acclaimed outdoor museum of western and ranch structures on the Texas Tech campus, open free to the public. In 2005, Humphreys, along with Giles Connell McCrary, Jr. (1919-2011) of Post in Garza County, was among five individuals presented with the Ranching Heritage Association "Founders Award."​<ref name=books/>

In 1970, Humphreys received the Gerald W. Thomas Outstanding Agriculturist Award. He was further honored by the American and Texas Hereford associations and the Southwestern Exposition and Livestock Show in [[Fort Worth]]. In 1990, the National Hereford Show was named in his honor.<ref name=find/> The Southwestern Exposition named Humphreys an honorary vice president in 2006-2007.<ref name= books/> ​

In 1970, Humphreys received the Gerald W. Thomas Outstanding Agriculturist Award. He was further honored by the American and Texas Hereford associations and the Southwestern Exposition and Livestock Show in [[Fort Worth]]. In 1990, the National Hereford Show was named in his honor.<ref name=find/> The Southwestern Exposition named Humphreys an honorary vice president in 2006-2007.<ref name= books/> ​