I found this excellent online source lately, a textual edition of George Washington Cable’s 1884 April Fool’s joke on Mark Twain. A good introduction, but the main delight is the reprinting of all the known hoax letters:

http://scholarlyediting.org/2017/editions/aprilfools/intro.html

John Bird

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10