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Goodreads Librarians Group
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Hard SF
1180 members — last activity Nov 26, 2025 05:12PM
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Book Barn Goons
366 members — last activity Oct 11, 2021 08:12PM
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/lit/
5 members — last activity Jan 27, 2010 07:16PM
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Reddit
2322 members — last activity May 26, 2022 02:58PM
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