I always love stories like this.
What I think is especially cool is that the recipe is owned by the NY Public Library, which implies that it could be used (or interpreted) by the public at large. I have a chance of making a brew George Washington thought up! (Though it’s more than likely it was Martha who actually brewed it.)
Of note; ‘small’ beers imply lower alcohol ones, while ‘stout’ would imply higher alcohol content, in the language of the day.
All that said; for a slightly more informed view on this event, I suggest Beervana.