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DJvu format is less common now; you can convert PDF to DJvu if needed.
: Houses a PDF upload of the original 1949 McGraw-Hill edition. Springer Nature Link 📘 Content Overview
Coxeter possessed a rare literary gift: the ability to explain complex visual concepts with rigorous precision, yet without unnecessary opacity. His writing is known for being "visual" — he invites the reader to see the mathematics rather than just manipulating algebraic symbols.
This is the safest bet. Search for "Coxeter Real Projective Plane" and filter by "Texts." The Archive offers multiple formats, including DJVU. As of 2025, the 1949 first edition (McGraw-Hill) is freely downloadable. The file is often named something like coxeter_real_projective_plane.djvu .