Nice find Daryl. The book on the left could be any of the first three editions (they were the same size with a yellow/brown dust jacket). The middle book is a fourth (shorter than all other editions) and the book on the right a fifth, sixth or seventh. It is still an impressive collection, despite the lack of the complete works of Homer Kelley.
Damn, I don't have 2 or 3. Damn again, I noticed the 4th is shorter but I never gave it thought. It's boxier/thicker looking too. My First has a yellow color jacket that matches the 4-5-6-and 7. Did the Jacket come in brown too? I didn't know.