by Barton, C. E., Amory-Mazaudier, C., Barry, B., Chukwuma, V., Cottrell, R. L., Kalim, U., Mebrahtu, A., Petitdidier, M., Rabiu, B., Reeves, C.
Published in Russian journal of earth sciences (24.11.2009)

by Cottrell R.L
Published in Proceedings Soil Conservation Society of America (1977)

by Cottrell R.L
Published in USDA Forest Service General Technical Report SE (1976)

by Cottrell, R.L
Year of Publication 1980

by Cottrell, R.L
Published in Soil Conserv Soc Amer Proc (1968)

by Cottrell, S.P, Cottrell, R.L
Published in Parks & recreation (Arlington, Va.) (2003)