Of course, Auburn was known as Alabama Polytechnic Institute (API) until 1960, when the name was formally changed to Auburn University. Mom says when they were there in the late 1940's everyone called it Auburn.
Further comments are below.
Theta Chi House ca. 1945
The website for the Auburn chapter of Theta Chi notes, "The first house was Dorm 12; the second house was located near downtown Auburn by the Freewheeler Bicycle Shop. Our third house, built in 1952, was located at 712 West Magnolia Avenue. Currently, we are living at 935 Lem Morrison Drive. The house was completed in the summer of 2007..."
At some point during his two periods at Auburn, interrupted by two years in the U.S. Navy, Dad was President of the fraternity. He was at Auburn from 1945 until July 1946 and again from 1948-50, when he was probably president. The house built in 1952 was being planned during that time; he and Mom left Auburn in December 1950 after he graduated.
The fraternity house shown in the photograph above is identified as the Theta Chi House ca. 1945 in a note in dad's handwriting on the back.
Dad and presumably some fraternity brothers in front of the Theta Chi house. Dad is on the right holding the books.
Ross Chemical Lab ca. 1945
This building on West Thach Avenue was built in 1930 and named after Bennett B. Ross [1864-1930], a longtime chemistry professor at Auburn.
Ross Chemical Building [now Ross Hall] in a 1948 postcard
Source: Alabama Postcards Collection via Auburn University Digital Library
Library ca. 1945 on West Thach Avenue
This library was one of the Carnegie libraries built in Alabama; it opened in 1910. You can see the interior at that time here. I've written a blog post about those libraries.
Today the library is Mary E. Martin Hall, named after the university's librarian from 1918-1949. The building house offices; when I arrived at Auburn in 1970, the registrar, graduate school and such were located there.
Auburn's current Draughon Library was built in 1962.
Here's the library in October 1910.
Women's Quad ca. 1945
A 1948 postcard of the girls' dormitories on the "quad" at Auburn
Source: Alabama Postcard Collection via Auburn University Digital Library
Dad and some fellow engineering classmates? ca. 1945
Alpha Gams 1946
I did not find any history or house photos on the Alpha Gamma Delta Auburn chapter website. Mom was not a sorority member, and she and Dad hadn't met yet, anyway!