Those two drawings were hand drawn copies of the stones which Travis had in his possession shortly before he passed away.
They were made by Pat Hainer and her husband, who had been invited to accompany Travis on his next hunt for the treasure he still believed he could find. They never got the chance, but Pat Hainer sent copies of the drawings they had made to Bernice McGee, along with a letter explaining the circumstances and additional notes added to the margins of the drawings, after reading McGee's story "An Invitation to a Ghost Walk" in a western magazine.
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Both of the above files are from Gary Cundiff's collection.