„…For each element, PTL contains videos showing chemical reactions, a fully
manipulable crystal lattice and unit cell (JMol image), lots of data on the macroscopic
and atomic levels, and a general description of discovery, uses, and other
properties…“
http://www.chemeddl.org/collections/ptl/
(Journal of Chemical Education, Vol. 85, 2008, No. 2, S. 195)
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