Non-existant books?
Adventures of the Dover Boys (1950) - #2
All Comics (Chicago Nite Life; 1945)
Animal Crackers (1946) 1 & 2 do not exist; (1950s) "nn, nd" -- no such thing, but there is a #9 (1957) published by Green that is not listed.... this is probably what the "nn" line refers to.
A-1 Comics #1 (1944) does not exist... the nn (Kerry Drake) is actual #1.
Attack (1953) OPG accurately lists two #5s, but is a bit confusing... the first is dated Jan '53, and the second is dated Sep '53.
Battle Fire (1955) #7
Blue Beetle #43
Camera Comics (1944) Two "nn" issues?
Captain and the Kids (1947+) #1-15
Catholic Comics (1946) #1-4
Comedy Carnival (1950s) This is not a separate comic, but is the same as "All-Picture Comedy Carnival"
Danger is Our Business! (1955) #4-10
Dime Comics #1 (1951) There is a 1945 issue.
Dream Book of Romance #124 (#9) (1954) Does not exist. This is supposed to be part of the A-1 series, and there is an A-1 #124 -- but it is a humor issue titled "Hot Dog".
Family Funnies #9 (1946)
Fightin' Marines #11 (Jan '53) There is no "Canteen Kate" by Baker in this issue... OPG has confused this with Approved Comics #11 ("Fightin' Marines") from Aug '54, which does have Canteen Kate.
Hercules (1968) OPG lists 2 "low distribution" magazine format issues for this Charlton title, #4 and #8. The #4 does not exist.
Hot Shot Charlie (1947)
Jester (1945) This Chesler title does not exist... it has been confused with Jest.
Johnny Hazard (1949) Ran from #5 thru #8. #35?
Jungle Jim (1949-1951) #16-20
Katy Keene Fashion Book Magazine OPG correctly lists that there are no #s 3 thru 10, but misses that there are no issues 11 and 12 either. The title runs #s 1, 2 and then 13 thru 23.
Keen Detective Funnies (1940) vol. 3#2
Kid Colt Outlaw (1950s Album) OPG lsits this as 132 pages in b&w with cardboard covers.... but it does not seem to exist. British or Canadian reprint?
Liberty Comics (1945) Issue #5
Love Tales #59 (Marvel)
Love Trails #2 (Marvel)
Merry-Go-Round Comics (1944) #21
My Secret Life #27 (1950) Double-entry in OPG... there is no 1950 issue, but the Sep '51 issues does exist.
Private Buck (1941) There is no Large Feature #22 with Private Buck.
Strange Story #1 (1946) Although some original art exists, the title was never actually piblished.
Super Duper (Harvey, 1941) There is a #3 issue from Howard, and there is one or more obscure issues from Britain, there is a Super-Dooper comic from Harvey, but the #5, #8, and #11 issues listed by OPG here do not exist.
Sweetie Pie (1955-1957) There are no issues 3 thru 14. There are only 3 issues.... 1, 2 and 15.
Sweet Romance #1 (1968) Charlton. Does not exist.
United States Marines #s 7 thru 11 by Toby do not exist.
Varsity (1945) Another title I can't confirm.... possibly this is a magazine and not a comic book?
Vic Flint (1949) #s 3 thru 5 do not appear to exist.