اذا لم تجد ما تبحث عنه يمكنك استخدام كلمات أكثر دقة.
Author: Thorndike, Edward L. (Edward Lee), 1874-1949
LoC No.: 22001968
Title: The Psychology of Arithmetic
Language: English
LoC Class: QA: Science: Mathematics
Subject: Arithmetic -- Study and teaching
Release Date: Mar 29, 2012
Copyright Status: Public domain in the USA.
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