“…For more Information regarding landslide map features, diagrams, recommendations, and advice for the non-technical reader the user of this map is urged to refer to Briggs, Pomeroy, and Davies (1975) and Pomeroy and Davies (1975). A discussion of the geology of the County is found in Patterson and Van Lieu (1971). Butler County is an integral part of a recent 1:125,000 scale geologic map of the Greater Pittsburgh region (Wagner et al, 1975).…”