Palmer, Charles Mervin, 1900-. Algae in Water Supplies: An Illustrated Manual on the Identification, Significance, and Control of Algae in Water Supplies., book, 1959; (https://digital.library.unt.edu/ark:/67531/metadc9129/m1/1/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .