Topper was published in 1926, so it's in the public domain in the US, and has been since 1st January 2022. The sequel, Topper Takes a Trip was published in 1932, and won't be in the US public domain until 1st January 2028.
Since Thorne Smith died in 1934, his works have been in the public domain the life+70 countries since 1st January 2005.
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