Here's the link to the Factory parts manual (1969) in PDF, with exploded diagrams
https://www.porsche.com/all/media/pdf/originalparts/usa/911-1_USA_KATALOG.pdf
Porsche sells a reproduction 1967 Drivers Manual, part number WKD460520. for an earlier edition, perhaps eBay
You can buy reproduction WKD-480-520 Factory Workshop Manual for 911 1965-1971. Volumes 1-2 WKD480520. There was a 912 supplement, perhaps one available on eBay