Perhaps other forumites might like to suggest where such publications might be obtained for a reasonable price.
Being ex- Coastal I have always been interested in flying boats, and the Catalina in particular. I even fly a radio control model of one. (R.A.F. markings of course) .
I was able to buy a facsimile copy of Pilots notes at the flying boat museum at Pembroke Dock a few years ago. They may be able to post you a copy, and the South American river also has them. A fascinating read