Guess The Book: Updated

Something a little different today.

I'll post a picture of the item I found, you guys guess what book it was found in.
Here's the pic:

April 16 1940
Received from J.C. Conway
20.00 Dollars
Mrs. Nils Sturbug (just a guess on that)

Edit: Here's the book:

"Sapphira and the Slave Girl" by Willa Cather. Published by Knopf, 1940.
Somehow I don't think the receipt was for the book.

-Click to enlarge photos-