Drainage Changes and Glaciation in the Danbury, Connecticut Region Connecticut State Geological and Natural History Survey Bulletin #30 by Harvey and Ruth Sawyer is a study of the effects of glaciation on the geologic processes of the Danbury, Connecticut region. The authors consider in detail the modifications of water drainage that occurred as a result of geological transformations caused by glaciation. The book is a valuable source of information for studying the relationship between the geological and climatic history of the region and its natural environment. It is recommended to researchers, employees of geological services, as well as to a wide range of readers interested in the geology and geological history of the region.