MLAC.H. Crocker Co. Portland 1901. Portland 1901 - TexasGeoDataPortal. No Scale Provided. https://geodata.lib.utexas.edu/catalog/pdx1901
APAC.H. Crocker Co. Portland 1901 [map]. No Scale Provided. Retrieved May 10, 2021, from https://geodata.lib.utexas.edu/catalog/pdx1901
ChicagoC.H. Crocker Co. Portland 1901 [map]. No Scale Provided. "Portland 1901 – UT Geodata". University of Texas Libraries Geodata Portal. <https://geodata.lib.utexas.edu/catalog/pdx1901> (10-May-2021).
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