Nomographs for computing the amounts of plankton pigments aa determined by the spectrophotometric method have been constructed. The methods used for alignment and scaling are discUBSed. The use of the nomographs shortens computation time considerably.
Duxbury, A. C., and Charles S. Yentsch. 1956. "Plankton pigment nomographs." Journal of Marine Research 15, (1). https://elischolar.library.yale.edu/journal_of_marine_research/866