Artwork by German POW "Walter Gotz" in 1945

Here's a portrait from the same source as yesterday: The Okie Legacy, Volume 8, Issue 39.

"This is the pencil sketch of a young girl in 1945, in Lebanon, Pennsylvania. Do you have any idea of the value of these items or can you direct me to someone who can help me. Thank you so much. I have no idea who the painting of house artist was." -- Marianne

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Text on the back (as best I can read it): "Mary Schreiber of Lebanon, PA painted by Walter Gotz (Götz?) year 1945 while stationed here as a German P.O.W.".