-Gunslinger, Other Books-
:- The Little Sisters of Eluria
:- The Gunslinger: Dark Tower I
:- The Drawing of the Three: Dark Tower II
:- The Waste Lands: Dark Tower III
:- Wizard and Glass: Dark Tower IV
:- Wolves of the Calla: Dark Tower V
:- Song of Susannah: Dark Tower VI
:- The Dark Tower: Dark Tower VII
:- ...These next books are related to the Dark Tower but not directly to Roland and his Ka-tet...
:- Salem's Lot, Father Don Callahan comes from here.
:- The Stand, Randall Flagg comes from here.
:- IT, Is IT the Crimson King? Nah.
:- The Eyes of the Dragon, Set in a Dark Tower world/ Flagg.
:- Rose Madder, picture contains portal to Lud.(Waste Lands)
:- Bag of Bones, yet to be read by me...
:- From a Buick 8, yet to be read by me...
:- The Talisman, Part I of the territories?
:- Black House, Sequel to the Talisman. Important to the DT series.
:- Insomnia, crucial to understanding the Dark Tower, also mentioned in DT 7.
:- Desperation, Can Toi connect this to the Dark Tower.
:- The Regulators, Companion to Desperation, also Can Toi.
:- Everything's Eventual: 14 Dark Tales, this contains The Little Sisters of Eluria.
:- Hearts in Atlantis, Low Men, and is the main character going to be a Breaker?
:- Skeleton Crew, short stories, I haven't read yet...
:- Childe Roland to the Dark Tower Came, Rober Browning's poem that started King's obsession.
:- Legends: Short Novels by the Masters of Modern Fantasy, Vol. 1, this also contains the Little Sisters.
:- Stephen King's The Dark Tower: A Concordance, Vol. 1, keeps stuff straight.
:- The Road to the Dark Tower: Exploring Stephen King's Magnum Opus, something like the Concordance.
:- The Stephen King Universe, looks at the connections between King's novels, it is out of date though.