The books that were most targeted in the challenges were ones "by or about Black or LGBTQIA+ persons," according to the report.
The "Communist Manifesto" author's name donned a study room at the University of Florida since 2014, but officials said world events led to the name's removal.
The books under scrutiny largely focus on topics like sexual orientation, race and gender identity.
The books involve "the study of sex, sexual preferences, sexual activity, sexual perversion, sex-based classifications, sexual identity, or gender identity."
Bayfield Middle School said the removal of "Aristotle and Dante Discover the Secrets of the Universe" by Benjamin Alire Sáenz has nothing to do with its content.
"This announcement is another major step towards making our public libraries, the heart of so many communities, accessible to all," Mayor Bill de Blasio said.
The book, written in 1954 by Darrell Huff, was last borrowed from the Newcastle upon Tyne City Library on November 25, 1958.
Organizers of a "Drag Story Time" for children planned at a New Hampshire library moved the LGBTQ pride event to a private venue amid backlash from locals, who reportedly contacted library trustees to complain.
For America to return to full health, we need institutions like libraries ready to help us connect with who we are and to energize us for what is to come.
From a camel library service in Kenya to book-carrying-robots in Sydney, these unique libraries keep the magic of reading alive.
Paul Dorr, who burned four LGBT children's books he got from the library, claims his actions were protected by the First Amendment. A judge disagreed.
Almost 8,000 jobs in UK libraries have disappeared in six years, as the profession faces its "greatest crisis in history."
The Knight News Challenge awarded a total of $3.2 million to 17 data projects on Tuesday.
The Baltimore Orioles postpone a second game against the Chicago White Sox Tuesday, but public libraries remain open.
How can anyone try to stop the spread of books and reading?
Following a blaze in Moscow, Newsweek asked professionals how they prepare for damage and rescue collections.