Robert Bailey Thomas (April 24, 1766 - May 19, 1846), also spelled Robert Bayley Thomas, was an American who created, and for a long time published, the Old Farmer's Almanac.
Thomas was born in Grafton, Massachusetts, served for a time as a schoolteacher and then bookbinder and book seller.
In 1792 he began his almanac which he continued to edit until his death.
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