Quote:
Originally Posted by Profiler
I would love to know where this appears in print
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I had to go looking and found a suggestion of Televues uses of Lanthanum here:
http://www.televue.com/engine/TV3b_p...d=78#.VJqRRA8Y
And I found other websites that state that Lanthanum was used in the Panoptics and Radian eyepieces.