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The porter recipe can be found on page 156 of “A Treatise on the Art of Brewing: Exhibiting the London Practice of Brewing Porter, Brown Stout, Ale, Table Beer, and Various Other Kinds of Malt Liquors” written in 1820 by Friedrich Christian AccumThis work is available for free on Google Books:https://play.google.com/store/books/details/Friedrich_Christian_Accum_A_Treatise_on_the_Art_of?id=CJVEAQAAMAAJ