For a long time I've had a bamboo suitcase filled with Dad-related ephemera: prints and proofs and F&Gs and extracted pages from magazines. I've finally started to archive the contents and put them in some kind of order.
This is one extract I just found, which I hadn't remembered well: it's an illustration for "The Day the Bears Go to Bed" by Jean George from the October 1966 issue of Reader's Digest.
Dad made the original (kept by the publisher) in ink on scratchboard when he was at the top of his game in that medium. And this was a "collaboration," so to speak, with Jean George that predated their pairing on the Newbery Award-winning novel, Julie of the Wolves(Dad's cover has since been replaced by another, but the pictures inside are his).