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There will be situations where the variant edition copy will contain data which is pertinent only to the specific edition of the work it represents, and is not relevant to the edition represented by the card.
Conversely, essential data represented on the card may not be present on the copy.
Make the proper adjustments to the variant edition copy and make sure the copy contains no extraneous bibliographic information irrelevant or inappropriate to the work represented by the card in hand.
Be careful particularly of the following fixed fields: PC, PD and the following variable fields: 240, 260, 300.