How many Dark Tower series are there?
9
Q280898
entity
The Dark Tower
Dark Tower series
Q1422318
The Dark Tower: The Gunslinger
Q1256948
The Dark Tower II: The Drawing of the Three
Q1637730
The Dark Tower III: The Waste Lands
Q670552
The Dark Tower IV: Wizard and Glass
Q2447323
The Little Sisters of Eluria
Q247364
The Dark Tower V: Wolves of the Calla
Q1637738
The Dark Tower VI: Song of Susannah
Q1472204
The Dark Tower VII: The Dark Tower
Q923111
The Dark Tower: The Wind Through the Keyhole