For years, I've had friends tell me that I should be reading Octavia Butler's works, especially Kindred. I actually own a copy, and it's been sitting on my shelves for years, waiting for me to pick it up. When it came to the point where I'd start writing about the 1970s, it was pretty clear that Butler would be one of the authors that I'd be covering, and I picked up the book as part of my research. She's a powerful author, and I'm a little sad that I didn't read the book earlier. Researching Butler's life is fascinating, and it's becoming clear to me that some of the genre's most important works emerge from outside of it's walls.
Book Sources to come - I don't have them on hand at the moment.
Many thanks as well to Steven Barnes, Ann Leckie and Gerry Canavan for their input for this.