|From Rosarum Monographia.|
Her chapter on "Libraries and Rose Books" lists the books that she used for her rose research. Ethelyn visited these books at libraries and gardens. Many of the books are online now. She might have loved the easy access to all of these old books. It would have have made research quite easy. However, I suspect that she enjoyed meeting the interesting people who took care of the books.
I have collected several of her references here and will add as I go.