by Young, E.S. Jr, Sharpe, W.E
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.09.1981)

by Wooding, N.H, Schmidt, J.S
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (1981)

by Wooding, N.H, Macialek, J.A, Wysocki, J.L
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.03.1979)

by Hutchinson, L.J
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.11.1978)

by Adams, R.S
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.09.1978)

by Collison, C.H
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.06.1978)

by DeWalle, D.R, Farrand, E.P
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.06.1978)

by Hughes, F.A
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.05.1978)

by Harper, J.C. II
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.04.1978)

by Shipman, R.D, Farrand, E.P
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.07.1977)

by Rader, T.D, Wingard, R.G, Heiney, C.L
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (01.08.1976)

by Harper, J.C. II
Published in Special Circular - Pennsylvania State University, Extension Service (USA) (1976)