by Spradley J.P
Published in Extension technical bulletin (USA). no. 206 (1993)

by Spradley, J.P
Published in FSA - Cooperative Extension Service, University of Arkansas (USA) (01.04.1993)

by Spradley, J.P
Published in FSA - Cooperative Extension Service, University of Arkansas (USA) (01.05.1992)

by Brady, P.L. (University of Arkansas.), Spradley, J.P
Published in FSA (USA) (01.03.1994)

by Spradley, J.P. (Cooperative Extension Service, University of Arkansas)
Published in MP - University of Arkansas, Cooperative Extension Service (USA) (1991)