No. 30049 - Stock tank water warmers. These units are set into the tanks and surrounded by a wooden box which acts as an insulator and results in warming only a small portion of the tank / F.D. Young / Nebraska

No. 30049 - Stock tank water warmers. These units are set into the tanks and surrounded by a wooden box which acts as an insulator and results in warming only a small portion of the tank / F.D. Young / Nebraska, MS0256-008073. National Agricultural Library Special Collections. http://localhost:8081/repositories/4/digital_objects/6703 Accessed May 29, 2026.