1
Assessment methods for soil carbon : [the International Workshop on Assessment methods for Soil C Pools was held at the Ohio State University Columbus, Ohio in November 1998] /
Book
Lal, R.
2001
“...URA - Soil chemistry...”
Table of Contents 
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Umwelt und Chemie : Umwelttagung 1996 : 7. bis 10. Oktober 1996 in Ulm /
Book
Bayer, E.
1997
“...URA - Soil chemistry...”
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