Tractors
Influence of the tractor on use of horses. L. A. Reynoldson. (U.S. Agriculture dept. Farmers’ bul. 1093) 26p pa ’20
Tractors in Connecticut. Walter T. Ackermann. (Connecticut. Agricultural college. Extension service. Bul. 25) 16p pa ’20 Storrs, Conn.
Treaty-making power
The treaty-making power in various countries: a collection of memoranda concerning the negotiation, conclusion and ratification of treaties and conventions, with excerpts from the fundamental laws of various countries. (U.S. State dept.) 89p pa ’19
Trees
Street trees. F. L. Mulford. (U.S. Agric. dept. Bul. 816) 58p pa ’20
Tree surgery. J. Franklin Collins. (U.S. Agriculture dept. Farmers’ bul. 1178) 32p pa ’20
Tree planting in Texas towns and cities. Lenthall Wyman. (Texas. State forester. Bul. 11) 40p pa ’20 Office of state forester. College Station, Texas
Tuberculosis