That's how I found it- Google. It is in the UC-Davis Special Collections with a title of "Inventory of the Nursery and Seed Catalog Collection". I didn't write more because I believe you have to go there in person to see the catalogs. Most special collections will photocopy but you need an act of the legislature- or the archivist, to take it to a place where you can do a color copy. But with a decent digital camera and their permission, you could photograph all the roses that are actually illustrated. Recall that in those days, two late 50s, one early 60s, color was expensive so only a fraction of CV got full color. And that may have not been the greatest. I have catalogs from several nurseries personally, but never had one from P & D. It was really pretty much before my time that they went under.

Another source is the Alfred Powers papers at the Oregon Historical Society, for a '62 catalog. It is in box 6, folder 7. libreference@ohs.org is their contact. They are in Portland.

I didn't chase this hard, but there may be older catalogs in another library collection somewhere.