Books for the NG AI R5x era

This is going to sound odd since everyone focuses on the latest and greatest, but I'm in a unique situation where I need book(s) covering the older generation of Check Point firewalls. There seems to be several books out there for it, but does anyone have a general favorite from back in the day? I could go download the admin guides and all, but I'd like reference books as well.
Hopefully-useful stuff I've written: http://kimiushida.com/bitsandpieces/articles/
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