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I find it interesting (and only us Kirby Freaks would) that Jack often drew on the back side of the pre-printed bristol board that I'm assuming Marvel gave him. I wonder why.
The blue line side was configured for regular comics while the Treasury edition's page proportions are different and tabloid size. They probably didn't have blue line for treasury pages. That's why Jack drew on the other side of the board.
I seem to recall Mark Evanier mentioning someplace that Kirby drew on the verso of the Marvel art board because he preferred the texture of the paper on the backside.
That may be about the texture--but the dimensions for the treasury were slightly wider and the length about a quarter inch shorter for the print dimensions. I think that Jack didn't want that blue line out of sink with the page layout. The blue line would have been inside the artwork left and right and a quarter inch short from the blue line at the bottom.
...when Jack did the regular comic of 2001 in the same year of 1976 as the treasury edition, he is using the blue line side, the correct page dimensions for the monthly comic.