1
Nitrogen fixation : hundred years after : proceedings of the 7th International Congress on N = Nitrogen Fixation, Köln (Cologne), March 13-20,1988 : with 81 tables /
Book
2
Nitrogen fixation in agriculture, forestry, ecology and the environment [E-Book] /
3
Plant growth: interactions with nutrition and environment : Meeting of the Society for Experimental Biology : Edinburgh, 04.89.
Book