Planck, Max (1858-1947). "Die physikalische Realitat der Lichtquanten", appearing in Die Naturwissenschaten, 30 June 1927, volume 15, pp 529-531. offered is the entire weekyl issue of pp 529-548. This paper is the published talk that Plank gave to the Franklin Institute in May and published at nearly the same time in the Journal of the Franklin Institute volume 204, Issue 1, July 1927, Pages 13–18. Fine copy, removed from larger bound volume. $45
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