Needed to write about Clark Hull recently. Naturally, most new history texts or learning text only provide cursory information about him now.
I remembered that somewhere in my office I had a copy of Marx and Hillix's old History and Systems text. Its coverage of Hull was more detailed and proved most useful to me. Being an academic pack rat (e.g., keeping that old book) once again was a good thing for me. Never throw anything away. That's my message.