During the past several years proposals have been made from time to time that new sources of either bulk food material or specialized extracted products could be developed if it were possible to utilize the tremendous amounts of plankton which exist in sea water, thereby increasing the general supply and alleviating certain shortages....
Shropshire, R. F.. 1944. "Plankton harvesting." Journal of Marine Research 5, (3). https://elischolar.library.yale.edu/journal_of_marine_research/616