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Ecoregions of North America: After the Classification of J.M. Crowley
Color-coded map showing the ecoregions of North America, including the polar domain, humid temperate domain, dry domain, and humid tropical domain.
Date:
June 1981
Creator:
Bailey, Robert G.
System:
The UNT Digital Library
[Map of Texas Railroads, 1980]
Map... Scale ca. 1:1,490,802.
Date:
June 1980
Creator:
Railroad Commission of Texas. Transportation Division.
System:
The Portal to Texas History