This just in from Germund von Wowern:

[Hi Didier!

Now I've compiled a list of all the Buck O'Rue artwork Richard Huemer and I are missing to complete the book. I'm making a last attempt to locate it through a few blogs, so if you could help us by posting a search plea we'd be exceptionally grateful. Practically the entire run Jan 15, 1951 to late 1952 is ready and scanned from black/white proofs and I have already spent much of last year cleaning up the artwork.

The year 1951 is 100% complete, so all the missing art is from 1952. We're only missing one single Sunday entirely (January 20, 1952), but would like to obtain the full 12-panel versions of the following:
Feb 3
May 4
June 8,15,22,29
July 6
August 10,17,24
December 14 and later, but these were probably never even produced.

The dailies are complete Jan 15, 1951 to July 19, 1952, except the week of July 7-12, 1952. These late dailies were probably never even published in newspapers at the time, but were most likely drawn.]