2013. Institute for Water Resources (U.S.). Navigation Data Center. This point shapefile contains the locations of waterways locks in the United States. The Navigation Data Center had several objectives in developin... United States. Bureau of Transportation Statistics.
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Belgium, Ministère de l'agriculture et des travaux publics. Ministère l'Agriculture et des Travaux Publics. Direction des travaux hydrauliques (Service des voies navigables) ; Librairie Ramlot Rue Grétry 25 ... Ministère de l'agriculture et des travaux publics.