BLIECK. A. & H. JAHNKE - Pteraspiden (Vertebrata, Heterostraci) aus dem unteren Siegener Schichten und ihre stratigraphischen Konsequenzen.

1979. N. Jb. Geol. Paläont. Abh. 159; pp. 360-378, 15 fig./phot. Orig. wrps. with cancelled libr. stamp, stapled extract, very good.

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