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This webpage may be helpful: https://www.archives.gov/digitization
There you will find a link to: "List of NARA Microfilm Publications and Original Records Digitized by Our Digitization Partners," which lists what NARA microfilm publications have been digitized by Ancestry, FamilySearch and Fold3.
If you are looking for genealogy records, there's also a link there for: "What You Can Find Online in Genealogy."
I hope this is useful.
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The Record Group Explorer data visualization provides a count of the number of scans of textual pages available through the National Archives Catalog. It also provides an estimate of the total number of textual pages currently in NARA's holdings. The list view in the Record Group Explorer provides the full set of data powering the Record Group Explorer. Clicking on the column headers allows you to sort the data by number of scans of textual records online, estimated total pages of textual records, or percentage available online. Learn more about these numbers.