Val Geist IS the authority in ungulates, at least for NA deer and also mountain sheep. He is a close friend and a valuable source of unbiased/accurate information. He has authored a book on WT's (White Tail tracks_Out of print but available from Amazon), another one called "Deer of the world" again, only available used from Amazon. He retired from UOC a few years back.
There is another great book by Koller called "Shots at whitetail". It is an awesome read.
CH
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