Kathryn Woodman Leighton (1875 - 1952)
Nothing on her in Wiki, but here's a bio of Kathryn on the Net .
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Kathryn Leighton at Dana Middle School
Never heard of her till now: apparently big on American Indian Art. I'm guessing another WPA work? (This is not the "whole painting." It was behind a table piled high with papers. I quickly took a snapshot with my phone camera.)