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  1. CP26Rendement, classement, caracteres et traitement des pommes a cidre pour la dessiccation
  2. Notes on some methods for the examination of soil protozoa
  3. Recolonisation of cultivated land allowed to revert to natural conditions
  4. Weeds on arable land and their suppression
  5. The atmosphere of the soil: its composition and the causes of variation
  6. Frequency distribution of the values of the correlation coefficient in samples from an indefinitely large population