Note that this particular PDF is PWYW, so keep that in mind if you enjoyed it: https://fabiensanglard.net/gebbdoom/
There's also a book for Wolf3D: https://fabiensanglard.net/gebb/ and the CP-System: https://fabiensanglard.net/cpsb/
There's also a book for Wolf3D: https://fabiensanglard.net/gebb/ and the CP-System: https://fabiensanglard.net/cpsb/
Besides, the PDF is now optimized and weights only 15miB instead of the 300 original MiB. So it does not kill my bandwidth budget :)!
I don't mind.