http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
an application of U. S. Bureau of Public Roads culvert capacity charts
23 pages 10 unnumbered leaves : illustrations, charts ; 28 cm.
"Culvert design charts, prepared by Division of Hydraulic Research, Bureau of Public Roads (partial set) reprinted": [10] leaves at end.