Hi, Ray,
Look at the way Hilda paint/draws feet...clogs....Dutch.... compare to Pg 55.
I own a few of her books, first print runs... similar style to her father or uncle...If I remember right she was influenced by a family member.
My mother knew her as a little girl...and they kept in touch for years, until my mother moved to Canada in late '50's
Good luck with your hunt, please keep us posted.
Cheers, Barbara