I found a great reference book in the magazine section at a local Border's Bookstore. It's
International Air Power Reveiw published by AIRtime Publishing. It's a volume series and it's the first time I've seen it anywhere. It's $19.95 U.S. (not including tax) but well worth it. It covers updated research on aircraft worldwide and goes over several aircraft in detail. Examples for this month are the F-104 Starfighter, the F-4 Phantom, the AH-1 Cobra, and the Lancaster Bomber...just to name a few. I found this by accident or coincidence, but I'm sure happy I added it to my ref collection.