Which pseudonym did Samuel Clemens use in his first known published sketch?

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Mark Twain American humorist and novelist Mark Twain, c. 1907.

The first pseudonym used by Samuel Clemens in a published sketch was "W. Epaminondas Adrastus Perkins." He signed a sketch with this name in 1852 while serving as a substitute editor for his brother Orion's newspaper in Hannibal, Missouri.1