In slip case.
pt. 1. / Alan Moore ... [et al.]
pt. 2. Scripts / Alan Moore with numerous sketches and an afterword by Kevin O'Neill.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The league of extraordinary gentlemen. Vol. 1. ISBN 1401200524. Published by America's Best Comics in 2003. Publication and catalogue information, links to buy online and reader comments.
