Looks like you can find this page by going to https://www.irs.gov/prior-year-forms-and-instructions https://www.irs.gov/prior-year-forms-and-instructions Then

Looks like you can find this page by going to https://www.irs.gov/prior-year-forms-and-instructions https://www.irs.gov/prior-year-forms-and-instructions Then sort by "revision date". 1864 seemed to be an outlier among that list, everything else is 1913 or later.