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Geometry for Elementary School - Wikibooks, open books for an open world
Text complexity of open educational resources in Portuguese: mixing written and spoken registers in a multi-task approach
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Elementary Mathematics from an Advanced Standpoint, Geometry : Felix Klein, E. R. Hedrick, and C. A. Noble : Free Download, Borrow, and Streaming : Internet Archive
Wikijunior - Wikibooks, open books for an open world