Frieda Fordham's Introduction to Jung's Psychology is a gem for those of us who just want to understand the gist of Jung and his terminology. Because I'm diving into the works of female Jungian analysts as another window into the Divine Feminine, I wanted a quick-reference book. This one was re-published in 1966 (originally published in 1953) with an updated biographical sketch, and, as far as I could determine, is still considered one of the best resources for an overview of Jung. I greatly enjoyed it, I must say!
I do highly recommend this thin volume for anyone who is curious about Jung. An additional benefit is that Jung himself approved the work; the editorial note states: "The reader can enjoy all the attractive qualities of the introductory exposition with the added satisfaction of knowing that it is authentic. It has Jung's own Imprimatur and his personal commendation." Nice!