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In the United States, anything published before 1923 is in the public domain. Any author who has been dead for 70 years (1938) is in the public domain EXCEPT that any works published after 1923 is still protected by copyright and will be for 95 years from original copyright year. The exceptions to this 95 year copyright period are for works which were copyrighted before 1950 and whose copyrights were never renewed. -- they entered the public domain in 1977 or earlier and were not re-copyrighted by the 1978 rewrite of the U.S. copyright laws.
For Canada and Australia, any author who has been dead for 50 years (died in 1958 or earlier) is in the public domain.
Most European countries have copyright terms of life-plus-70 so authors who died before 1938 are public domain.
It seems from Forester's years and publication dates that his work is still protected by copyright and will be for a long time to come.
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