A number of historical documents show the development of Montessori education and the Montessori movement in the early years of the 20th century.
McClure’s Magazine ran an influential series of articles on Maria Montessori and Montessori education from 1911 to 1914.
The Beinn Bhreagh Recorder, a record of meetings and experiments at Alexander Graham Bell’s Nova Scotia estate, contains early observations of the Montessori classroom established there as well as articles by Bell and from the New York Times, and records of the early American Montessori movement.