Charles W. Boning 1973 <p>This index identifies locations on streams where the U. S. Geological Survey has investigated the time of travel of a highly soluble material moving through a reach of stream channel. This index provides information only on the location of studied stream reaches; it contains no basic data. It does contain, however, a list of references to published data and analytical reports on time of travel and a list of U.S. Geological Survey offices where basic time-of-travel data are on file.</p> application/pdf 10.3133/wri7334 en U.S. Geological Survey Index of time-of-travel studies of the US Geological Survey reports