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Hartmann and Haller
The flowers are small and greenish in colour
well endowed with organic substance and with a pH around neutrality
come altri microrganismi utili
Impulsi scientifico-spirituali per il progresso della fisica vol. 1- Rudolf Steiner antroposofica Hartmann and HallerThree research directions of conventional natural sciences and their contrast with the Goethean method. Page 192 Publisher: Antroposofica Editrice
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