Sasol/Princeton Field Guide: Birds Of Southern Africa

I am a bit confused as this book seems to have two publishers, this may be a geographical thing.  I bought the 3rd edition (2002) published by Sasol the last time we were in South Africa in April 2009 and found the maps and illustrations to be of a very high standard.  The latest edition – 4th edition was published by Princeton in Nov 2011 (at least for the USA market) and is available on Amazon.com.  The authors are the same – Ian Sinclair, Phil Hockey, Warwick Tarboton & Peter Ryan.

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