The money cost of repetition versus the money saving through acceleration
By: by Leonard P. Ayres ...
Series: [Russell Sage foundation. Dept. of child hygiene. Pamphlets] -- no. 111
Published: 1912
Place of publication: New York City
Language: eng
Number of pages: 12
Subjects: Education -- United States -- Finance.; Education -- United States -- Statistics.; Slow learning children.
Genres: Statistics.