1. USDA-ARS-AFSRC; 1224 Airport Rd.; Beaver WV 25813
2. Texas Agric. Res. Station; 1229 North U.S. Hwy. 281 Stephenville TX 76401
3. Dep. of Soil and Crop Sci.; Texas A&M University; College Station TX 77843
4. Texas Agric. Res. Station; 17360 Colt Rd. Dallas TX 75252
5. USDA-ARS-GRL; 7207 W. Cheyenne Rd. El Reno OK 73036
6. Texas Agric. Res. Station; 3507 HWY 59 E Beeville TX 78102