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1. The Cambrian–Ordovician Boundary

Source: Geological magazine : Vol. 121 Iss. 1-6 Year. 1984Material type: Article Article; Format: print Availability: Items available for reference: (1).

2. Aspects of the ordovician system

by E.N.K.C.

Source: Geological magazine : Vol. 122 Iss. 1-6 Year. 1985Material type: Article Article; Format: print Availability: Items available for reference: (1).

3. Cambrian–Ordovician boundary issue

by Fortey, Richard A.

Source: Geological magazine : Vol. 126 Iss. 1-6 Year. 1989Material type: Article Article; Format: print Availability: Items available for reference: (1).

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