Valve. (open access)

Valve.

Patent for a float-valve used in water-troughs for cattle and other liquid containers. It closes "when the surface of the water reaches the desired point and [opens] when the surface of the water falls below said point" (lines 14-17).
Date: January 5, 1897
Creator: Halley, Hillary H. & McCulley, Robert I.
Object Type: Patent
System: The Portal to Texas History

P.L. 94-171 County Block Map (2010 Census): Tom Green County, Block 6

Parent map for Tom Green County, Texas showing the area of one geographic block for which the U.S. Census Bureau collected data. The plotted map scale is 1:20,000.
Date: January 7, 2011
Creator: United States. Bureau of the Census.
Object Type: Map
System: The Portal to Texas History
Public Supply Ground-Water Use in Western Texas (open access)

Public Supply Ground-Water Use in Western Texas

Report documenting an inventory of West Texas underground water supply for public use and consumption.
Date: January 1989
Creator: Ashworth, John B. & Nordstrom, Phillip L.
Object Type: Report
System: The Portal to Texas History