You have requested access to download the full text of the source (SourceID: 268332): Bock, W. (1970). Felsen und mauern als diatomeenstandorte. In: Diatomaceae II (J. Gerloff & J.B. Cholnoky, eds.). Beihefte zur Nova Hedwigia. 31: 395-441, 3 pls.
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