>>530501075
Dunno if you tried here yet, but it can be pretty useful:
https://archive.org/details/buildingtechnologyheritagelibrary

What styles did you have in mind? When you said Pacific Northwest, instantly thought of the Shed style, pic related. Googling "fundamentals of [architectural style]" may also yield good results. If you don't know the names, you can post pics of what you're looking for, and I'll see what I can find.