Absolutely. In fact, the best thing you can do for someone in segregation is to fill their days with plenty of stuff to read. Letters and photos keep them connected - but books, magazines and newspapers will bridge that gap of no outside contact.
https://www.inmateaid.com/ask-the-inmate/can-an-inmate-still-receive-their-mail-although-they-are-in-segregation#answer
Accepted Answer Date Created: June 25,2013