Bolted joint design
Club banger on bolted joint analysis
Flange/seal design
Design Of Liquid Propellant Rocket Engines, Huzel and Huang
https://ntrs.nasa.gov/api/citations/19710019929/downloads/19710019929.pdf
Chapter 9, Design of Interconnecting Components and Mounts
1992 version is a lot better than the OG for flange stuff