NASA Voyager 1 & 2 Owners' Workshop Manual - 1977 onwards (VGR77-1 to VGR77-3, including Pioneer 10 & 11): An insight into the history, technology, ... sent to study the outer planets and beyond

I'd also highly recommend "NASA Voyager 1 & 2 Owners' Workshop Manual" https://smile.amazon.com/gp/product/0857337750

It goes into amazing detail on the history of the spacecraft and the events that made it possible. For example: the story of an intern figuring out the '3 body' problem and, from there, the concept of 'gravity assist' gave me goosebumps