What books have been banned or challenged in Oklahoma? It's complicated.

According to PEN American's Index of School Book Bans , these books have been banned or have been proposed to be banned over the years at various Oklahoma public schools.

In addition, a second list shows the books "investigated" by then-Attorney General John O'Connor. O'Connor's investigation, however, was short, and he later said he had decided it was an issue for parents and local school boards.

More: It didn't start with Ryan Walters: Oklahoma has a long history of banning books and movies

Books challenged in Oklahoma public schools:

• "Narrative of the Life of Frederick Douglass" by Frederick Douglass
• "Lord of the Flies" by William Golding
• "I Know Why The Caged Bird Sings" by Maya Angelou
• "A Raisin in the Sun" by Lorraine Hansberry
• "The Outsiders" by S.E. Hinton
• "To Kill a Mockingbird" by Harper Lee
• "Of Mice and Men" by John Steinbeck
• "The Hiding Place: The Triumphant True Story of Corrie Ten Boom" by Corrie Ten Boom
• "Eclipse (Twilight Series)" by Stephenie Meyer
• "The Dark Descent of Elizabeth Frankenstein" by Kiersten White
• "Bless Me, Ultima" by Rudolfo Anaya
• "Speak" by Anderson, Laurie Halse
• "Infandous" by Elana K. Arnold
• "Whale Talk" by Chris Crutcher
• "I Was Here" by Gayle Forman
• "Symptoms of Being Human" by Jeff Garvin
• "Melissa (George)" by Alex Gino
• "Bad for You (Sea Breeze Series)" by Abbi Glines
• "Looking for Alaska" by John Green
• "Burned (Burned Series)" by Ellen Hopkins
• "Crank (Crank Series)" by Ellen Hopkins
• "Their Eyes Were Watching God" by Zora Neale Hurston
• "Brave New World" by Aldous Huxley
• "Hold Me Closer: The Tiny Cooper Story (Will Grayson, Will Grayson Series)" by David Levithan
• "For Black Girls Like Me" by Mariama J. Lockington
• "A Court of Frost and Starlight" by Sarah J. Maas
• "Fairest: Levana's Story (The Lunar Chronicles Series)" by Marissa Meyer
• "The Bluest Eye" by Toni Morrison
• "Before I Fall" by Lauren Oliver
• "Broken Things" by Lauren Oliver
• "Bridge to Terabithia" by Katherine Paterson
• "Mastiff (Beka Cooper Series)" by Tamora Pierce
• "All American Boys" by Jason Reynolds
• "House of Furies (House of Furies Series)" by Madeleine Roux
• "Between Shades of Gray" by Ruta Sepetys
• "The Lovely Bones" by Alice Sebold
• "The Way I Used to Be" by Amber Smith
• "The Hate U Give" by Angie Thomas
• "Suicide Notes From Beautiful Girls" by Lynn Weingarten

Books under review in Stillwater Public Schools:

• "The Truth About Alice" by Jennifer Mathieu
• "Me and Earl and the Dying Girl" by Jesse Andrews

Books under review in Tulsa Public Schools:

• "Gender Queer: A memoir" by Maia Kobabe
• "Flamer" by Mike Curato

More: Emails tell how creation of library advisory committee led to lawsuit by Edmond schools

Books under investigation by Oklahoma's AG in 2022

In February 2022, Oklahoma Attorney General John O’Connor released a list of 54 books his office would evaluate to determine whether they violated the state's obscenity law after he received comments from concerned parents.

Days later, he appeared to walk back the promise of an investigation.

The list included:

• "A is for Activist" written and illustrated by Innosanto Nagara
• "The Every Body Book: The LGBTQ+ Inclusive Guide for Kids About Sex, Gender, Bodies and Families" by Rachel E. Simon
• "The Perks of Being a Wallflower" by Stephen Chbosky
• "Gender Queer: A Memoir" by Maia Kobabe
• "Lawn Boy" by Jonathan Evison
• "Forever" by Judy Blume
• "Queer: A Graphic History" by Meg-John Barker and Julie Scheele
• "Be Gay Do Comics" by The Nib
• "Two Boys Kissing" by David Levithan
• "Jack of Hearts (And Other Parts)" by L.C. Rosen
• "The Bluest Eye" by Toni Morrison
• "Bad For You" by Abbi Glines
• "Before I Fall" by Lauren Oliver"
• "George" by Alex Gino
• "Speak" by Laurie Halse Anderson
• "Between Shades of Gray" by Ruta Sepetys
• "For Black Girls Like Me" by Mariama J Lockington
• "You Should See Me In a Crown" by Leah Johnson
• "On Thin Ice" by Michael Northrop
• "The Dark Descent of Elizabeth Frankenstein" by Kiersten White
• "Fairest: The Lunar Chronicles: Levana’s Story" by Marissa Meyer
• "House of Furies" by Madeleine Roux
• "I Was Here" by Gayle Forman
• "Hold Me Closer" by Will Grayson
• "Whatever" by Michel Houellebecq
• "Dear Evan Hansen" by Val Emmich and Steven Levenson
• "The Lovely Bones" by Alice Sebold
• "Symptoms of Being Human" by Jeff Garvin
• "Whale Talk" by Chris Crutcher
• "Red White & Royal Blue" by Casey McQuiston
• "Zenobia" by Morten Durr
• "Mastiff" by Tamora Pierce
• "Two Can Keep a Secret" by Karen M McManus
• "Burned" by Ellen Hopkins
• "Scary Stories to Tell in the Dark" by Alvin Schwartz
• "Infandous" by Elana K Arnold
• "Broken Things" by Lauren Oliver
• "The Absolutely True Diary of a Part Time Indian" by Sherman Alexie
• "All American Boys" by Brendan Kiely and Jason Reynolds
• "The Hate U Give" by Angie Thomas
• "13 Reasons Why" by Jay Asher
• "Looking for Alaska" by John Green
• "Bless Me Ultima" by Rudolfo Anaya
• "Brave New World" by Aldous Huxley
• "Crank" by Ellen Hopkins
• "The Chocolate War" by Robert Cormier
• "I Know Why the Caged Bird Sings" by Maya Angelou
• "Lord of the Flies" by William Golding
• "Bridge to Terabithia" by Katherine Paterson
• "Of Mice and Men" by John Steinbeck
• "A Court of Frost and Starlight" by Sarah J Maas
• "Suicide Notes" by Michael Thomas Ford
• "By the Time You Read This I’ll Be Dead" by Julie Anne Peters
• "Milk and Honey" by Rupi Kaur

This article originally appeared on Oklahoman: What books have been banned or challenged in Oklahoma? It's complicated.