*useful rscs:
http://www.rsc.org/periodic-table
https://archive.org/details/tucows_288003_Periodic_Table
periodic.zip
bookos/bookza
http://bookza.org/md5/64E720574C76CF1C21AE36B6EDF47248
http://tech4teaching.org/wpblog/?p=311
http://www.uky.edu/Projects/Chemcomics/index.html
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