Joshua, Son of None was published in 1973. Woody Allen's "Sleeper" also came out in 1973 and featured cloning. Well before that, "The Clone" (1959) by Theodore L. Thomas.
"Clone" is difficult to search for in Google Books because it can easily be a mis-OCR for either "close" or "done", or possibly other words ...
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"Clone" is difficult to search for in Google Books because it can easily be a mis-OCR for either "close" or "done", or possibly other words ...