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![Plane trigonometry, solid geometry and spherical trigonometry, by Walter W. Hart...and William L. Hart... 1942 [Leather Bound] Plane trigonometry, solid geometry and spherical trigonometry, by Walter W. Hart...and William L. Hart... 1942 [Leather Bound]](https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1697930172l/124396017._SX98_.jpg)