+1 R
I also still have Part 1 and 2 of these Mass Pro books. Both are essential (ying/yang). When you’re outnumbered by Engineers 30:1 it helps to know your basic MFG & materials. Makes you more grounded than just a fluffy aesthetic guy.
A vendor I deal a lot with is UFP Technologies based in Georgetown MA. They do IMEVA too (aka CROCS).