These links provide more background information on freedom to read and why some books get challenged or banned.
When searching for more information on freedom to read here are some search terms to try:
Evans, Robert C.
Z 1019 C46 2019
"Censored & Banned Literature examines the wide range of important literary texts that have been subjected to censorship, either at the time of their first publication, later in their history, or both." -- publisher
Moore, Nicole
Z 658 A8 M66 2012
Abstract:
A history of book censorship in Australia; what we couldn't read, didn't read, didn't know, and why we didn't. For much of the twentieth century, Australia banned more books and more serious books than most other English-speaking or Western countries, from the Kama Sutra through to Huxley's Brave New World and Joyce's Ulysses.
Hill, Lawrence
Z 659 H55 2013
"In 2011, Canadian writer Lawrence Hill received an email from a man in the Netherlands stating that he intended to burn The Book of Negroes, Hill's internationally acclaimed novel....... All who are interested in literature, freedom of expression and human rights will appreciate this passionate defence of the freedom to read and write"--Back cover.
Báez, Fernando
Z 659 B34 2008
An investigation of the reasons behind book destruction spanning from ancient Sumer’s smashed tablets, to book burnings in modern times and censorship against authors past and present.
Barbour, Scott
Z 657 C393 2010
Abstract: "This book is a collection of articles in which authors debate the state of freedom of speech and the use of censorship in the United States and around the world."
Ross, Val
Z 1003 R75 2006
"Written for children ages ten and up, You Can’t Read This explores the development of alphabets, the decoding of ancient languages, and censorship in Ancient Rome and modern America."--publisher.
Haight, Anne Lyon
Z 1019 H15 1978
"From 387 B.C. to the present, Banned Books covers over 300 books that have provoked censure - including many classics and important contemporary publications...discover the who, when, where, and why of literary censorship." -- front cover flap.
Fellion, Matthew
Z 658 G7 F45 2017
" .... A vital reminder that the freedom of speech has always been fragile and never enjoyed equally by all, Censored offers lessons from the past to guard against threats to literature in a new political era."--provided by publisher.
Heins, Marjorie
Z 658 U5 H42 2001
"The first comprehensive history of the debate about censorship designed to protect children. ..." -- from the publisher.