Peter Hill Explains

Theodore Grays Periodic Table Transitions Ti Zr Hf W


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titanium, zirconium, hafnium, tungsent http://lessonpeer.com/drhillteach/Theodore%20Grays%20Periodic%20Table%20Transitions%20Ti%20Zr%20Hf%20W.mp4
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Peter Hill ExplainsBy Peter Hill