American astronomer (1906–1997) best known for discovering Pluto in 1930. Souvenir typescript, two pages, 8.5 x 11, from his book Pot of Darkness, reading in part: “A terrific thrill came over me. I switched the shutter back and forth, studying the images. Oh! I had better look at my watch and note the time. This would be a historic discovery.” Signed at the top in blue ballpoint by Tombaugh. In fine condition, with staple to top left, a spot of soiling above signature, and light handling wear. RRAuction COA.
