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In page Gettysburg Address:

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The Hay copy of the address[b] was first announced to the public in 1906, following a search for the original manuscript of the address. It was found among the papers of John Hay.[1] The Hay copy differs somewhat from the manuscript of the address described by Nicolay in his article, and includes several omissions and insertions made by Lincoln, including omissions critical to the basic meaning of the sentence, not simply words that would be added by Lincoln to strengthen or clarify their meaning.[citation needed] In this copy of the address, like the Nicolay copy, the words "under God" are not present.