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You may address fields by their three digits code. Additionnally, it's possible
to select a subfield by appending a dollar sign ($) followed by the subfield code,
e.g. 010$a. Multiple selection is possible with comma-separated
values, e.g. 001,210$d,856$u.
If you need help selecting fields, you can use the searchbox below. First, you need to select a Marc format definition.