In the collection of statistics relating to traffic, the Corps of Engineers is directed to adopt a uniform system of classification for freight, and upon rivers or inland waterways to collate ton-mileage statistics as far as practicable.
(July 25, 1912, ch. 253, §1,
Section is from part of section 1 of act July 25, 1912, popularly known as the "Rivers and Harbors Appropriation Act of 1912".