- Stump, Edmund2
- Sveriges geologiska undersoĢkning2
- TacheĢ, A. M2
- Taride, A2
- Taylor, Richard B.2
- Tennessee. State Geological Survey2
- The Farmer [magazine] (Publisher)2
- Thrasher, Frederic Milton, 1892-19622
- Tufts, Wm. O.2
- Twiss, W. Patrick2
- United States. Army. Engineer Regiment, 29th2
- United States. Department of Agriculture. Division of Publications2
- United States. Forest Service. California Region2
- United States. Forest Service. Intermountain Region2
- United States. War Department. General Staff. War College Division2
- United States. Weather Bureau2
- Upham, Warren, 1850-19342
- Valck, G. (Gerard), 1651 or 1652-1726.2
- Vermont. Department of Highways2
- W.A. Fisher Company2