Observations on the Development of the Intelligence in a Montessori School. Tromp, C. W. The Call of Education, 2:38–46, 1925. Multiple OCLC records. 72750589 is the most widely held/complete.
Observations on the Development of the Intelligence in a Montessori School [link]Paper  bibtex   
@article{tromp_observations_1925,
	title = {Observations on the {Development} of the {Intelligence} in a {Montessori} {School}},
	volume = {2},
	url = {http://www.worldcat.org/oclc/72750589},
	journal = {The Call of Education},
	author = {Tromp, C. W.},
	year = {1925},
	note = {Multiple OCLC records. 72750589 is the most widely held/complete.},
	pages = {38--46}
}
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