Category:EQ articles with ISC set 'n/a'

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Tracks instances of {{Infobox earthquake}} where |isc-event= is set "n/a" (not available). This should be mainly for events in the range of 1900 to 1964. Events before 1900 should include |pre-1900=yes to suppress the ISC link. If an event after 1964 has no record there may be a question of notability.