Clarence Edward Keefer, a sanitary engineer, was born in Baltimore in 1891, and received his B.E. from Johns Hopkins in 1919. From 1940 to 1945, Keefer was an instructor in sanitary engineering at JHU. He published an important work in his field in 1940. Collection consists manuscript pages of chapters from Keefer's "Sewage-Treatment Works: Administration and Operation" dating from 1935 to 1940.