It looks like this DocumentCloud project embed is misconfigured. If you’re interested in finding the documents, you can search DocumentCloud and probably find them with some variation of this search term (you might need to tweak it a bit; here are some tips):
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If you help maintain this site, please go to DocumentCloud, add the appropriate documents to a project, and click the pencil icon next to the project name to generate a working embed code. If you run into issues, please reach out to support for further assistance.