The little-known history of April Fools' Day — seriously, this is no joke
Microfilm and Microfiche Collections | University of Michigan-Dearborn
The History of April Fools' Day
The first Fool: a history of April Fools' Day – The Armijo Signal
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VIRTUAL FLAG: Homeland Defense exercise sharpens skills, deters enemy aggression > North American Aerospace Defense Command > Newsroom
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April Fools' Day: Origins, Meaning & Hoaxes - HISTORY
