We have a few Charlton books that supposedly feature Joe Maneely art on site, and I'm scanning yet another one from my collection (Wyatt Earp, Frontier Marshal 21) at the moment. But to me, the stories that are attributed to him (I'm going mostly by the GCD here for exact stories) don't look that much like any other work I've seen of his. This has been commented on in some articles; I've seen one where Dr. Vassallo describes them as "Sparsely drawn Westerns". Since I was scanning the book I wanted to throw the subject up for discussion, since I haven't heard much said about his (or other Atlas artists) work at Charlton after the Atlas implosion, other than brief mentions that it happened.
It is an interesting quick of the publishing history around then: at least three artists (Williamson, Maneely, and Severin) worked on both Atlas's and Charlton's concurrently running Wyatt Earp series in the late 50's.