The now-familiar "Radiographic Atlas of Skeletal Development of the Hand and Wrist" opened an important chapter in the systematic evaluation of skeletal status. Unlike its predecessor, Todd's "Atlas," it was based on the clinically-normal, middle-class Brush Foundation children. Like Todd's radiographic atlas, it provided age and sex-specific photographic standards. And for those workers interested in more than flip-through appraisal, the series of maturity indicators in the Greulich-Pyle "Atlas of the Hand" offered remarkable reliability in the hands of a careful evaluator.