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Black River was named by Lieutenant G. M. Stoney, U.S. Navy (USN), in 1885. Its Eskimo name, according to Lieutenant Cantwell (1884, p. 61), U.S. Revenue-Cutter Service (USRCS), was "Umakalookta," "Am-mok-a-look-tok (or tah)," "Um-nok-a-luk-ta," or "Um-ok-a-look-tok." (USGS).
Black River, (official name), U.S. Geological Survey. Geographic Names Phase I data compilation (1976-1981). 31-Dec-1981. Primarily from U.S. Geological Survey 1:24,000-scale topographic maps (or 1:25K, Puerto Rico 1:20K) and from U.S. Board on Geographic Names files. In some instances, from 1:62,500 scale or 1:250,000 scale maps.
US Geological Survey (USGS), https://www.usgs.gov/