Prior to Webster's Third the Unabridged had been expanded with each new edition, with minimal deletion.
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Webster's Third New International Dictionary of the English Language, Unabridged (commonly known as Webster's Third, or W3) was published in September 1961.
It was edited by Philip Babcock Gove and a team of lexicographers who spent 757 editor-years and .5 million.
The final copy went to the typesetters, RR Donnelley, on December 2.
The book was printed by the Riverside Press in Cambridge, Massachusetts.