Pratt Steel Bridges

I am searching for information on some of the Pratt Steel Bridges that were found on the D&RGW narrow gauge lines. Some still exist today. I would appreciate any drawings or photos that anyone is willing to share or directions to such drawings or photos. I am familiar with the John Maxwell collection. Those in particualar are the bridges that were west of Gunnison, the one at Almont, the twin bridges at Chama, the one that has been identified to me as the Florida bridge, or any other Pratt bridge that anyone knows about. I do have ample information on the one just north of Durango. Any information on the others would be appreciated and I can be contacted through the forum or directly at: kgmilner@brightok.net.
Thanks - Ken