[From Adam Matic 2014.22.01 1730 CET]
I just found the 1973 edition of BCP available on the The Open Library
Reading it requires free registration and there are a few options for reading. Looks great even though someone was underlining and writing on the margins a lot.
I was looking for texts on control theory. Lots of them there. For example, here’s a book Bill mentioned a few times, Korn and Korn, Electronic Analog Computers, first edition 1952. https://openlibrary.org/works/OL983186W/Electronic_analog_computers
The book is also listed in the 1960. General Feedback Theory of Human Behavior, part I. Relevant for modeling and control systems.
This book is by F.A.Hayek (the economist who also wanted to be a psychologist) https://archive.org/details/sensoryorderinqu00haye
Bill mentioned it in LCS, The Cybernetic Revolution in Psychology article. Interesting read.