This is a very nice, very clean complete scan of the 2e AD&D WBG, By Rich Baker.
I have physically owned this about 3 times, it is my go to for designing campaigns for any system, except modern, or wild west.
THere are some areas in the text that need erratta'd calculating kingdom sizes, but it is overall, one of the best products in gaming ever made for the campaign designing homebrew referee.
You can use this book to start top down, bottom up, or somewhere in the middle, with chapters that focus on each stqage of continent, region, province and city.
I started using this to design my own Birthright world. And these days use it with Pathfinder's Complete Campaign.
This is not a ready made campaign, this is a book of charts, tableas and ideas to completely do it yourself. If you like Drawing campaign worlds and making maps and detailing a setting, especially a fantasy setting, this is the book you need. It also works for doing worlds for games like Traveller, but you'd need to convery over the icosahedral world displays, or just use this system. It does not have charts for generating or detailing races, it assumes you are using AD&D races and monsters.
But this is my go to bible ffor world generation. I often loaned this to other GMS as the printed book, and didn't get it back.
Thanks for putting this up here, all my physical copies the covers have long ago worn off, lost the maps, never returned from bowwed out, etc.