This torrent contains all The Rook stories published by Warren as well as the first appearance of Harris publications version of the character. I found these in a bunker all but forgotten along the electronic wasteland. A thorough search of the current sources suggested that the Warren issues were nowhere else to be found.
The Rook is a time-traveling comic book character whose adventures were chronicled in various issues of Eerie magazine published by Warren Publishing in the 1970s and 80s, before getting his own title. He was created by writer Bill DuBay. He appeared in Eerie #82-85, 87-95, 98-105. He got his own Rook Magazine which ran 14 issues from 1979 to 1982 (after which he returned to Eerie and concluded the storyline in #132 and continued in 134 and 136). Warren Presents #2 reprints the stories from Eerie #82-85. Eerie isues #116 and 120 had stories staring his great-grandfather.
The Rook is actually a scientist named Restin Dane. Dane comes from a family of scientists whose members include the unnamed protagonist of the novel The Time Machine by H.G. Wells. Dane gains his nickname from the fact that his time machine resembles a giant chess rook. Dane takes to wearing Western style clothing and a gunbelt. His first adventure is to travel back in time to the Alamo to save an ancestor. He does succeed in saving his great-great-grandfather Bishop Dane, who accompanies him on many of his adventures, along with two robots he built.
In a later adventure, he meets the Time Traveler (who is revealed to be his grandfather Adam Dane) from Wells' book, and helps him in a war between the Eloi and the Morlocks.
Harris Comics would later 'revamp' the character in name only, first in a mini-series "Chains of Chaos", then giving him a short-lived series for 5 issues (#0-4) in 1995. Below is a link to the most detailed information in The Rook http://www.pjfarmer.com/woldnewton/Rook.htm
Thanks to the scanners and the original source from a long forgotten corner of internet comic book history.