Hello, with that spelling, was used in publications as early as 1833. These include an 1833 American book called The Sketches and Eccentricities of Col. David Crockett, of West Tennessee,[2] which was reprinted that same year in The London Literary Gazette.[3]

The word was extensively used in literature by the 1860s.[4]

http://upload.wikimedia.org/wikipedia/commons/4/47/20081217_PRESSER-5199.jpg

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