Braunschweig: Friedr. Vieweg & Sohn, 1921. First Edition. 8vo., paged 132-139; VG-; white cover with black print, penciled notation at top, mild smudging along spine and bottom edge, bumped corners with slight tears at spine, slight spotting; back has blue library stamp at bottom left, slight spotting, some smudging and creases; interior clean with clean text; text in German; "Zeitschrift fur Physik, Sonderabdruck Band 6, Heft 2."
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