Map includes: data for water districts, fruit and vegetable shipping from 1926 to 1939, temperature and precipitation data for 1911-1939, statistics on all valley rail road lines, and town and county information including elevations and census information for 1920, 1930, and 1940.
Tamm, Alfred, "Map and general information of Lower Rio Grande Valley of Texas" (1940). Maps. 14.
Maps; Texas--Lower Rio Grande Valley; 1940-1949