by N. E. Otto, T. R. Bartley and J. S. Thullen, illustrated by D. W. Cunningham and J. M. Evans.U.S. Dept. of the Interior, Water and Power Resources Service1980.<RB274-58>
U.S. Dept. of the Interior, Water and Power Resources Service, Division of Operation and Maintenance Technical Services, Engineering and Research Center197u.<NA171-37>