Faulkner, William. Sartoris (New York : The New American Library, [1964]). Thomas Merton's Marginalia Collection.

Item

A full-text version of the entire work (in a different edition) is available at:
https://archive.org/details/in.ernet.dli.2015.125862/page/n14/mode/2up.

An edition like Merton used is available to borrow:

https://archive.org/details/sartoris0000faul_o3m5.

Merton mentions Sartoris in his journals, see also:

http://www.merton.org/research/Quotations/details.aspx?id=889

Title
Faulkner, William. Sartoris (New York : The New American Library, [1964]). Thomas Merton's Marginalia Collection.
Publisher
https://bellarmine.on.worldcat.org/search?databaseList=638&queryString=ti%3ASartoris
See accompanying link to Bellarmine University library catalog for the publisher and other bibliographic information.