Bob, I have not seen the Sibley Guide. I use several tree books for field reference. One-A guide to field identification'Trees of North America by C. Frank Brockman, Two- National Audubon Society Field Guide to North American Trees, Eastern Region. Three- Guide to Southern Trees by Ellwood S. Harrar and J George Harrar. All deceit books, I've learned much from these sources. They have all been invaluable for in during my learning years. However' I find they contain a few mistakes. It to me, is difficult to have a field guide that could contain everything. I'm fortunate to have a good memory, when I see a photo, drawing, etc., I usually can recall it in the field with no book. But as I age my ability to do has been floundering. I'll have to check this new guide out. If you like it Bob, then it must been good! Larry
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