From the June 30, 1941 FCC Annual Report Archivist's comments in (brackets). Mississippi River Radiotelephone Service Following analysis of the record of an informal hearing at Memphis on October 28, 1910, and upon completion of a detailed engineering study concerning related frequency allocation matters, the Commission allocated six frequencies between 2000 and 12000 kilocycles for assignment to ship and coastal-harbor telephone stations on the Mississippi River and connecting inland waters. Thesefrequencies have transmission characteristics which will permit communication on the Mississippi River system and connecting Intra-coastal Waterway over distances up to several hundred miles. Three coastal-harbor stations have been licensed (WJG, KMP, and WGK) for public telephone service with river vessels, and five applications (Louisville, Pittsburgh, Chicago? and ???) are on file. In addition, the Inland Waterways Corporation, a governmental enterprise, has requested authority to use radio- telephony for communication with its 37 ship stations through the medium of the land station owned and operated by this organization at Memphis. At the Memphis hearing it was shown that 60 vessels operating on the Mississippi River system had licensed radio stations on board. Seventeen of these vessels had telegraph equipment only, 21 had telephone equipment only, and 22 had both telephone and telegraph equipment. It was conservatively estimated, however, that the total number of towboats on the Mississippi Rlver and its tributaries exceeds 500.