These biological bibliographies may be found useful as pertinent references for those working in water pollution control, sewage treatment and water treatment. The bibliographies are by no means complete. The references in them were selected largely on their availability and for their potential usefulness to those not trained primarily in biology. These brief bibliographies can serve those in water pollution control programs, sewage treatment, and water treatment in unfolding information that may be basic to a good understanding of certain biological problems that could arise in the course of professional work. Marine waters are not considered.