Help! HQ of some Batman comic covers

[MrSpace86]

I have been looking for Hi-Res downloads of the cover to some Batman, Superman, X-Men, and Spider-Man covers. If anyone can post them here, send them to me, or post a link, I would really appreciate it.
The covers I am looking for are:
-Detective Comics #27
-Detective Comics #38
-Batman #1
-Action Comics #1
-Amazing Fantasy #15
-X-Men #1

Thanks!