{"id":"archive_timeline_summary","columns":[{"name":"year","type":["integer","null"]},{"name":"document_count","type":["integer","null"]},{"name":"source_document_count","type":["integer","null"]},{"name":"total_bytes","type":["number","null"]},{"name":"pdf_count","type":["integer","null"]},{"name":"text_chars","type":["number","null"]},{"name":"tabular_file_count","type":["integer","null"]},{"name":"tabular_rows","type":["number","null"]}],"empty_values":"CSV empty fields and JSON null mean unavailable; an explicit zero is numeric zero.","source_reference":"Source URL plus page, row, column, or line fields where supplied. Financial columns keep their own budget stages."}