Scanned and cropped from a copy of Lilienthal's 1963 book, Change, Hope and the Bomb, inscribed by Lilienthal to James MCormack, former Director of Military Applications for the United States Atomic Energy Commission.
This signature is believed to be ineligible for copyright and therefore in the public domain because it falls below the required level of originality for copyright protection both in the United States and in the source country (if different). In this case, the source country (e.g. the country of nationality of the signatory) is believed to be Ηνωμένες Πολιτείες Αμερικής.
Note that this tag cannot be used on all signatures, as not all signatures are copyright-free.