1. 1
   The role of grain legume N₂ fixation in the nitrogen cycling of temperate cropping systems

   by Jensen, Erik Steen
   Published 1997

   Roskilde, Denmark : Risø National Laboratory, [1997]

   1 v. (various pagings) : ill. ; 24 cm.

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2. 2
   Studies on the nitrogen metabolism of leguminous plants

   by Roponen, Ilma
   Published 1970

   [Helsinki, 1970]

   18 p. 24 cm.

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