Open Archives contains data from over two hundred archive repositories. Most archives are Dutch and Belgian. There are also sources from France, Suriname, Indonesia and the United States.
Go to the page Overview of archive repositories. Click on an archive. You then see which sources that archive has supplied and how many records that is. On the page Number of records you see the numbers per archive, per source type, per place and per year.
No. Archives are still working on indexing their sources. New sources and additions are added regularly. Can't you find something? Then the source may still be missing. Also check the website of the archive itself.
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