Musa McKim’s career seems to have been overshadowed by her rather famous husband, Philip Guston. As far as the world wide web goes, she seems to be better known for her writing than her painting. You can read much of Musa’s musings, as collected by her daughter Musa, not to be confused with her mother Musa, at Google Books.
McKim made one post office mural: Spanish Hill and the Early Inhabitants of the Vicinity (Waverly, New York).