Dear Bol;
Saw your post on google in passing as I also have a Dietrich seragraph and am looking to appraise its value. However, there is a website www.dietrichart.com that was put up by surviving members of his family that at least gives a bio on the artist and his work. Thought you might want to know if you haven't run into it already. Please let me know if you find any references to its value.
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