Richard Old posted on Facebook in January 2018 a booklet with this cover showing Pullman Main Street. He said, he "came across this booklet in an estate I was working on. It was done by a WSU fifth year architectural design class, apparently around 1969. The first picture (the booklet front cover) is Pullman the way it was..." The class project, he said, was funded by the Pullman Chamber of Commerce.
It looks like the booklet might be this ....
"Central Business District Development: Pullman. Pamphlet. 1968 October"
... according to "Guide to the Historic Ephemera Collection 1880-2016
SC 004" of WSU MASC/Manuscripts, Archives & Special Collections
http://ntserver1.wsulibs.wsu.edu/masc/finders/sc004.htm
