I experienced a wave of nostalgia seeing the covers of these books. Many of the BASIC listings were for the 'lowest common denominator' version of BASIC, and be

I experienced a wave of nostalgia seeing the covers of these books. Many of the BASIC listings were for the 'lowest common denominator' version of BASIC, and being lucky enough to have a BBC Micro, I tinkered with them to improve the graphics and sound. I tried downloading "The Mystery Of Silver Mountain" book, and several pages in the listing part of the book appear to be blank (e.g. pages 18, 19, 20) when viewed with Preview on macOS. They display correctly in Windows 10 with Edge, and when viewed online (in Google Docs?)