By Dundar H.   Lewis D.R.   in Economics of Education Review

ISSN:0272-7757|14|2|119-144

Elsevier‎(1995)‎

Access to resources Favorite 12.689863

By Lewis D.R.   McGechan M.B.   in Journal of Agricultural Engineering Research

ISSN:0021-8634|72|3|275-290

Academic Press‎(1999)‎

Access to resources Favorite 10.791643

By McGechan M.B.   Lewis D.R.   in Journal of Agricultural Engineering Research

ISSN:0021-8634|75|4|429-447

Academic Press‎(2000)‎

Access to resources Favorite 10.791643