CAMBURN, Keith E., & Donald F. CHARLES 2000 (April 14) Diatoms of low-alkalinity lakes in the northeastern United States Philadelphia: Academy of Natural Sciences of Philadelphia Special Publication 18 152 pp., incl. 37 pls., 5 tables [incl. n.spp. in Fragilaria, Eunotia, Pinnularia, Cymbella, Gomphonema]