by Phelps W.R, Czabator F.L
Published in Forest Insect and Disease Leaflet - U.S. Dept. of Agriculture (1978)

by McCracken F.I
Published in Forest Insect and Disease Leaflet - U.S. Dept. of Agriculture (1977)

by Werner R.A, Baker B.H
Published in Forest Insect and Disease Leaflet - U.S. Dept. of Agriculture (1977)

Published in Forest Insect and Disease Leaflet - U.S. Dept. of Agriculture (1976)

by Massey, C.L, Lucht, D.D, Schmid, J.M
Published in Forest Insect and Disease Leaflet - U.S. Dept. of Agriculture, Forest Service (USA) (01.12.1977)

by Hinds, T.E
Published in Forest Insect and Disease Leaflet - U.S. Dept. of Agriculture, Forest Service (USA) (01.02.1977)