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Thank you for your work as a Citizen Archivist! When adding tags in the National Archives Catalog, capitalization is not critical. Tags can be mixed capitalization, or all lowercase letters. (We typically do not recommend using all capital letters, as it can sometimes be more difficult to read on the computer screen.) Search results in the Catalog are not case-sensitive, so the tags you add will be searchable in the Catalog no matter the capitalization.
You are correct that tags are comma delimited, so you can add multiple tags at once by separating each one with a comma.
I hope this is helpful! Thank you again for your contributions.
Community Manager, National Archives Catalog