· 218 von Koenigswald: Tooth enamel ofthe cave bear • ANN. ZOOL. FENNICI Vol. 28 for 2—5 s...
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· 218 von Koenigswald: Tooth enamel ofthe cave bear • ANN. ZOOL. FENNICI Vol. 28 for 2—5 s with 2N I-ICI. The structures are then visible under a reflecting light microscope,