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Guidelines_English_Final
تحميل الدليل التدريبي

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http://www.chemweb.com
Chemistry port, free abstracts, conferences
 
http://portal.acs.org
 
http://www.rsc.org
 
http://www.chemdex.org/
 
http://www.webqc.org/symmetry.php
 
Periodic table on the web with information on each elements
 
Symmetry operations
 
Symmetry Challenge
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