I have an original version that I used for my English Literature O-level back in 1979. Produced by Pan Study Aids.
Those notes allowed me to gain one of the few O-Levels that i managed on my first attempt. [The others, not that any of you could give a toss really, were English Language, Maths and History].
Despite the fact that this book was produced for those studying To Kill a Mockingbird at GCSE level and despite the fact that I am now at post-graduate level, I found this a really interesting little read.
The book's focus was very simplistic, but this allowed for a good basis with which to further explore the classic novel myself.