1. 01 មិថុនា 1969 The science of limnology concerns that water which falls on the solid earth and is retained on the surface, if only temporarily. 39 pages, illustrated, photos
  2. 01 មករា 1982 Limnology is the study of the structural and functional interrelationships of organisms of inland waters as they are affected by their dynamic physical, chemical, and biotic environments.