"Originally published in single magazine format as Graveyard of empires issues #1-4"--Indicia.
Includes: Circle / writer/artist, Paul Azaceta ; letterer, Thomas Mauer.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Graveyard of empires by Mark Sable. ISBN 9781607067399. Published by Image Comics in 2013. Publication and catalogue information, links to buy online and reader comments.
