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- OCR-text (abbyy)
Biser, Irwin A general schema for natural systems.(Nature considered as a function of types of selectivi- ty and of modes of selection.^ 8:o Philadelphia 1938. Diss. University of Pennsylvania. (University of Pennsylvania.)
- OCR-text (abbyy-crop)
Biser, Irwin A general schema for natural systems. (Nature considered as a function of types of selectivi- ty and of modes of selection. 8:o Philadelphia 1938. Diss. University of Pennsylvania. (University of Pennsylvania.)
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