by Elterich, G.J, Wellmaker, G
Published in A. E. pamphlet - University of Delaware, Dept. of Agricultural Economics (1982)

by Elterich, J, Wellmaker, G
Published in A. E. pamphlet - University of Delaware, Dept. of Agricultural Economics (1981)

by Elterich, J, Powell, J
Published in A. E. pamphlet - University of Delaware, Dept. of Agricultural Economics (1981)

by Brucker, S.M
Published in A. E. pamphlet - University of Delaware, Dept. of Agricultural Economics (1980)

by Brucker, S.M
Published in A. E. pamphlet - University of Delaware, Dept. of Agricultural Economics (1980)