Remember that Kickstarter the other day to reprint 1975’s NASA Graphics Standards Manual? It’s been funded, but if you want to get your hands on the content now, NASA has released the book as a PDF.
If you’re looking for more NASA logo history, the agency has also published Emblems of Exploration:
This publication concentrates on the rich and interesting history of the conception and implementation of the world-famous NACA and NASA seals and insignias that have been displayed for decades on aeronautics and space research vehicles and facilities, as well as those proudly worn by flight research pilots, astronauts, and the dedicated employees of these two world-class organizations.
I know how I’m spending my afternoon.