Hardaway, J.E., Kimball, D.B., Lindsay, S.F., Schmidt, Jack, and Erickson, Larry, 1977, Subirrigated alluvial valley floors, in Papers Presented before the Fifth Symposium on Surface Mining and Reclamation, Louisville, Ky., October 18-19-20, 1977: National Coal Association and Bituminous Coal Research, Inc., p. 61-135.