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P.L. 94-171 County Block Map (2010 Census): Jeff Davis County, Index
Index map for Jeff Davis County, Texas showing the distribution of census blocks and smaller inset areas for which the U.S. Census Bureau collected data. The plotted map scale is 1:230,288.
Date:
November 27, 2010
Creator:
United States. Bureau of the Census.
Object Type:
Map
System:
The Portal to Texas History
Speed-Changing Gear.
Patent for an automatic speed changing gear for trains.
Date:
October 27, 1908
Creator:
Mayo, William C. & Houlehan, John
Object Type:
Patent
System:
The Portal to Texas History
Governor for Explosive-Engines.
Patent for a governor for explosive engines for use in trains, which will increase the fuel efficiency of the engines.
Date:
April 27, 1909
Creator:
Mayo, William C. & Houlehan, John
Object Type:
Patent
System:
The Portal to Texas History