The mass explained to boys and girls
By: by Maria Montessori; adapted for use in American schools by Ellamay Horan.
Contributors: Horan, Ellamay, b. 1898, ed.
Publisher: Sheed and Ward; W. H. Sadlier, inc.
Published: 1934
Place of publication: London, New York; New York, Chicago
Language: eng
Number of pages: 144
Subjects: Mass.
Notes: Dr. Montessori's text published in London, 1932, under title: The  mass explained to children.