The present measurements were undertaken to extend our knowledge of the transparency of ocean waters to areas to the south of the Bermuda region and to the east of the Caribbean region beyond the limits of earlier investigations ( Oster and Clarke, 1935; Clarke, 1938 and 1939)....
Clarke, George L.. 1941. "Observations on transparency in the southwestern section of the North Atlantic Ocean." Journal of Marine Research 4, (3). https://elischolar.library.yale.edu/journal_of_marine_research/597