Proceedings of a symposium - Taylor, H. M.; Box, J. E., Jr.; Bland, W. L.; Brown, D. A.; Coleman, D. C.; Smucker, A. J. M.; Snider, R.; Upchurch, D. R.; Buxton, D. R.; Stuber, C. W.; Mortvedt, John J.; Ernst, Susan (American Society of Agronomy, Inc. Crop Science Society of America, Inc. Soil Science Society of America, Inc., 1987)
ASA Special Publication Number 50.