You searched for: Creator Personal Names Welch, J. A. (James A.) Remove constraint Creator Personal Names: Welch, J. A. (James A.) All Creators Barth, K. M. Remove constraint All Creators: Barth, K. M. All Subjects Urea. Remove constraint All Subjects: Urea. Subject Topical Sheep--Feeding and feeds. Remove constraint Subject Topical: Sheep--Feeding and feeds.