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Continue to ChatGeology of the agate and opal - bearing formation in the Dereyalak village (Eskişehir). - https://avesis.comu.edu.tr/publication/details/96c7f041-bf5f-44d5-a268-fe53331ac2a3/geology-of-the-agate-and-opal-bearing-formation-in-the-dereyalak-village-eskisehir