Back in the scanning saddle after a busy school year, just added:
Tim McCoy #21 (final issue of the series)
to the Charlton section.
The Tim McCoy series is now lacking only #16, the first issue. I have a low-res scan of #16, but in true Charlton fashion the original comic seems to have been collated while the ink was still wet, so a lot of pages are almost unreadable. I'm still looking for a cleaner copy.