اذا لم تجد ما تبحث عنه يمكنك استخدام كلمات أكثر دقة.
Author: Ontario. Department of Education
Title: Ontario Teachers' Manuals: Nature Study
Language: English
LoC Class: LB: Education: Theory and practice of education
LoC Class: Q: Science
Subject: Science -- Study and teaching (Elementary) -- Ontario
Subject: Nature study
Release Date: Jul 28, 2008
Copyright Status: Public domain in the USA.
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