Their is now a marvelous ID book for "the Antelope of Africa" very detailed and as far as I can tell all encompassing . which I can thoroughly recommend.
Available from Amazon
https://www.amazon.com/Antelope-Africa-Willem-Frost/dp/1431406082?ie=UTF8&*Version*=1&*entries*=0
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0 repliesAvailable from Amazon
https://www.amazon.com/Antelope-Africa-Willem-Frost/dp/1431406082?ie=UTF8&*Version*=1&*entries*=0