These are lithographs published in the 1950s for sponsors of an annual art event in New York city, I think it was for Artists Equity. The prints are for sale on Ebay.
The PASTORAL LOVES Of DAPHNIS And CHLOE. Done into English, with an Introduction by George Moore. Illustrated with Etchings by Ruth Reeves.
On Wind of Change, Virginia Kent. Illustrations by Ruth Reeves