I discovered this letter a bit late to place in order for 1945. The envelope shows it is from Arnold's Boston days and seems to describe activities from his lumberjack time in northern California.
I am not sure who Eva is, but here is an undated photo and note from here. The ranch she mentions might be the Elmer's logging camp; that is of course a complete guess on my part. The photo and note may be from a year or two earlier.
next post 1945 Salt Lake City
previous post April 19, 1945
first post in Arnold's Story July 1943
first post in blog Leonard's Story: May 29, 1943