Hello,
I like to search in coins and exonumia for all items with reference to one of the listed catalog.
For a single number I can add the number into the field and get the result. But how I can filter all coins referenced to this catalog?
Are there some wildcards like
==#blank (selection of all coins WITHOUT a reference to the selected catalag)
<>#blank (selection of all coins WITH a reference to the selected catalag)
available at numista?