Tom; To tell the truth I have them all, and they all have thier good points and bad. Arts #8 was put out last summer, #9 is just released, and for me it is the hardest because not numbered or index, and as Art states keep it simple it is! William just keeps it up dated faster, and for me alphabetical is easy. Case in point were do I find the Plantation Station? Buy them all and cross reference them to each other for a real average. Semper Fi. Chuck