I found some more information about Nella Larsen on the internet, and her career is matching to this Sunday Stamps' theme also: she was both a nurse and a novellist.
I didn't know her books so far. But now that I was searching for more information, I found out that her novel 'Passing', first published in 1929, still is available (and even has been translated into my language, Nederlands / Dutch). As it is about two women from mixed families (which is a dear theme to me) I just ordered it, to read it more than ninety years after Nella has written the book.
Nella's stamp was accompanied by a stamp of an other writer, plus a matching postmark of the Harlem Renaissance movement (many thanks to FinnBadger for these stamps and postmark):
