by Conrad, P. W., Sweigard, R. J., Badaker, V., Graves, D. H., Barton, C. D.
Published in International journal of mining, reclamation and environment (01.09.2008)

by Kumar, D, Sweigard, R J
Published in Mining Engineering (01.12.2011)

by Conrad, P W, Sweigard, R J, Graves, D H, Ringe, J M, Pelkki, M H
Published in Mining engineering (01.10.2002)

by Rohlf, R A, Sweigard, R J
Published in Mining Engineering (01.03.2009)

by Rohlf, R A, Sweigard, R J
Published in Mining engineering (01.03.2009)

by Slone, B K, James, F A, Lineberry, G T, Sweigard, R J, Maggard, D S
Published in Mining engineering (01.10.2001)