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Heinrich Credner . de ber die Gliederung der oberen Juraformation und der WealdenBildung im Heinrich Credner pt Obra de geologia de Heinrich Credner professor de geologia da Universidade de Leipzig google br id FiAAAAAcAAJ printsec frontcover dq HeinrichCredner hl en sa ved CEUQAEwBmoVChMIzGicLfxwIVzBWQChspAXF onepage Heinrich Credner