I once had a landlady who would only read Perry Mason books. She was elderly, a Phi Beta Kappa, Berkeley graduate, and the widow of a judge. I believe her family had known Earl Stanley Gardner, the creator of Perry Mason. They had also known Jack London, but those books didn't interest her.
She had a stack of well worn Mason's that she'd read over and over. Some held together with rubber bands. I started checking Mason books out of the library for her. Then I began buying them for her at the bookstore. She always paid me back. This was at a time when Earl Stanley Gardner was still being published. Good luck finding any Perry Mason books new on a shelf these days.
Anyway, I also started hunting in thrift stores and used book stores. I enjoyed it. I kept a list with me of the ones I'd bought so I wouldn't buy duplicates for her. I enjoyed the hunt. I wasn't keeping them. I'd even find them on vacation and be thrilled when I got home with my new treasure for her. Always she'd pay me back, even when I'd insist it was a gift.
When my landlady died I asked her family, a husband and wife related to her through her deceased husband, if I could have the Perry Mason collection. Okay, this still irks me. They were so incredibly petty. They'd never shown interest in these books. They'd never bought her any. There were over 50 books in the collection, all paperbacks from various time periods. A really interesting range of covers. Weeks and weeks passed until one day the guy shows up with a box. He said, "Here, my wife kept the rest." What do you think they gave me? The ones falling apart. The ones with rubber bands holding them together. Basically if it was still in useable condition the wife kept it. Annoying people.
Because I spent so many years looking for Perry Mason books I still look for them. Now I buy them out of habit if they have an old interesting cover. I have about 25 books, most in sad condition. Make that VERY sad condition. Below are the rare exceptions.
I have no idea about illustrators for any of them. No information is given.
Oh, and I once went to the home of Raymond Burr, television's Perry Mason. This was after he had died and I was with a group, there to see his hot house. Sound's odd, doesn't it? Well he had a stunning collection of orchids. A hot house full of them. He was renowned for cultivating the mysterious and temperamental flower. You can still visit the hot house at his winery, Raymond Burr Vineyards.