The Theory of Groups and Quantum Mechanics (originally published in German under the title "Gruppentheorie und Quantenmechanik") by Hermann Weyl. Translated from the second - (revised) German edition by H. P. Robertson. Dover Publications, Inc. (no date). Hardcover with dust jacket. DUST JACKET: Dj is tattered with chips and tear. A bit delicate. Not price-clipped. BOOK: Heavy wear to bottom cover tips with some bumping there. Moderate cover edge wear otherwise. A smudge inside the front cover appears to be from remnants of a price sticker. Previous owner name in black ink on the first blank page. Paper lightly tanned with no effect on paper flexibility. No other previous owner markings. The first few pages have a light crease down the middle. No tears to pages. Binding is tight with no looseness to pages. Not ex-library, not remaindered and not a facsimile reprint. For sale by Jon Wobber, bookseller since 1978. HH21a
I have seen this edittion being attributed as being published in 1931. This is not possible, as Dover was not founded until 1941 according to Wikipedia.