2011. Beningo, Steve, Liu, Zhi, United States. Bureau of Transportation Statistics, and United States. Bureau of Customs and Border Protection. This point shapefile depicts points of entry for land modes along the United States - Canada border and the United States - Mexico border. The port... United States. Bureau of Transportation Statistics.
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2011. National Atlas of the United States. This poygon shapefile portrays the distributions of United States and Canadian bat species during the past 100-150 years (1830-2009). The specimen ... National Atlas of the United States.