371.26
G
Gray , Clarence Truman , 1877-
Variations in the grades of high school pupils, by Clarence Truman Gray ... Baltimore , Warwick & York , inc. , 1913.
3 p. 1 . , 3 - 120 p. tables , diagrs . 20 cm. (Educational  psychology monographs.... no.8)
Bibliography : p. 115 - 116