Aggie (Texas A&M nickname)

“Aggie” is someone at Texas A&M. The nickname seems obvious enough. However, citations are rare before 1906.
 
The Maryland Agricultural College (now the University of Maryland) used “Aggie” several years before 1906.
 
 
Wikipedia
Texas A&M University, often Texas A&M, A&M or TAMU for short, is the flagship institution of The Texas A&M University System. 
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Texas A&M University’s main campus is located in College Station, Texas, also known as Aggieland.
 
Wikipedia
Texas Aggie is a term encompassing all those who are students or former students of Texas A&M University.
 
Wikipedia
On March 6, 1856, the University of Maryland was chartered as the Maryland Agricultural College (MAC).     
 
13 March 1902, Washington Post, pg. 8:
The first game of the season is close at hand, March 19, with the Maryland Aggies.
 
11 October 1903, Washington Post, pg. 8:
SHUT OUT BY AGGIES.
Hyattsville, Oct. 10. The Maryland Agricultural College football team continued its fine work at college to-day when the strong eleven from Washington College, Chestertown, was defeated by a score of 28 to 0, this being the third consecutive game in which the agriculturists have shut out their opponents.
   
27 November 1906, Dallas Morning News, “Big Game Thursday,” pg. 12:
Austin, Tex., Nov. 25.—The football season will end on Thursday of this week, when the regular annual Thanksgiving game will take place between the two giant Texas teams, the one from the State University and the other from the Texas Agricultural and Mechanical College. It is always a contest for blood and the winners know they have been through a mill, but this year the battle promises to exceed anything of the past. The Aggies have played and won all of their games by handsome scores and have a heavy team well coached.
 
18 November 1909, New York Times, pg. 9:
Texas “Aggies” Still Undefeated.
DALLAS, Texas, Nov. 17.—The Texas Agricultural and Mechanical College eleven defeated the Oklahoma State University eleven by a score of 14 to 5 in the game of football played in Dallas to-day.