Analysis of information sources in references of the Wikipedia article "Core catcher" in English language version.
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: CS1 maint: archived copy as title (link) (Brochure in German, describing the concept of the core catcher for the EPR in Finland){{cite web}}
: CS1 maint: archived copy as title (link) (Brochure in German, describing the concept of the core catcher for the EPR in Finland)