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Source and copyright: This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed.

Source and copyright: This work is in the public domain in that it was published in the United States between 1923 and 1977 and without a copyright notice.

Source and copyright: This work is in the public domain in that it was published in the United States between 1923 and 1977 and without a copyright notice.

Source and copyright: This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed.

Source and copyright: This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed.