Dave Cockrum design sketches for the rex kit.
These came up for auction on ebay back in September of 2013.

Tyrannosaurs Rex - sold for $1800.00
This piece is an original, ink over pencils with some white-out applied as correction, drawn by Cockrum and is signed in black ink in the upper right corner "Cockrum '73".

Artwork is done on light cardstock and is approx. 13-7/8" High x 21-7/8" Wide. Sheet is being sold as pictured, has not been mounted or displayed and luckily, was stored away from light since the '70's, so the black ink is not faded. There are some pencil notes on bottom of sheet.

Artwork has some light toning and spotting, it has not been cleaned nor will be attempted, left up to new owner if they desire to do so. Corners have some light creasing, but have been flattened out over time from being stored flat.
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Stegosaurus - listed for $400.00 but best offer was accepted
Black and White stats had varied uses from making color guides which were hand colored to show representation of the finished product prior to printing and or litho process, to give close-up to the sculptor in creating the molds for the finished product. These were printed directly from the original artwork. This positive print sheet, printed on gloss stock, is approx. 14" High x 25-1/4" Wide. Sheet is in overall nice in some light signs of handling on edges and corners along edge wrinkles and small splits on edges. There is also some toning on edges and some spotting. This stat has been stored away flat, luckily away from light since 1974 so the image is dark and not faded.