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![Cover for Hallard T. Croft · Unsolved Problems in Geometry: Unsolved Problems in Intuitive Mathematics - Problem Books in Mathematics (Paperback Book) [Softcover reprint of the original 1st ed. 1991 edition] (2013)](https://imusic.b-cdn.net/images/item/original/625/9781461269625.jpg?hallard-t-croft-2013-unsolved-problems-in-geometry-unsolved-problems-in-intuitive-mathematics-problem-books-in-mathematics-paperback-book&class=scaled&v=1556314620)