I lived in Austin from 1966-1979. While I was there, I stumbled over an historical marker denoting the first use of barbed wire in the state. It was located down on on the north bank of the Colorado, just off the Congress Ave. bridge, in the vicinity of the foot of Brazos Street.
Is that marker still there? If so, could I impose on one of you to go take a picture of it and email me a copy?