Rolex Resource Recommendations

Hi all, I'm new to the forum and to the world of watchmaking and am looking for books that I can read up on. I'm particularly interested in the world of pre-Daytona chronographs, especially the anti-magnetique chronographes. Could anyone suggest resources that I can read up on? Also does anyone know how one would go by acquiring such a watch other than auctions as they can get very expensive. Thanks so much!😀