TY - JOUR<br>AU  - Susan Cachel<br>T1  - Walker, A. and C. Stringer (eds.) -- The First Four Million Years of Human Evolution.<br>JO  - PaleoAnthropology<br>Y1  - 2011<br>VL  - 2011<br>SP  - 284<br>EP  - 286<br>ER -