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- Partielle Differentialgleichungen und deren Anwendung auf physikalische Fragen by Riemann, Bernhard (1882). available in print
- Philosophy And Fun Of Algebra by Boole, Mary Everest (1909). available in print
- Die Potentialfunction und das Potential by Clausius, R. (1885). available in print
- A Presentation of the Theory of Hermite's Form of Lame's Equation by Chittenden, J. Brace (1893). available in print
- A Primer Of Quaternions by Hathaway, Arthur S. (1896). available in print
- Principes d'algèbre, à l'usage des écoles d'arts et métiers et des écoles professionnelles by Bobillier, Étienne E. (1877). available in print
- Principes de géométrie analytique by Darboux, Gaston (1917). available in print
- Principes de la théorie des fonctions entières d'ordre infini by Blumenthal, Otto (1910). available in print
- The principles of projective geometry applied to the straight line and conic by Hatton, J. L. S. (1913). available in print
- Probability and theory of errors by Woodward, Robert Simpson (1906). available in print
- Projective differential geometry of curves and ruled surfaces by Wilczynski, E. J. (1906). available in print
- Projektive geometrie der ebene, unter benutzung der punktrechnung (Volume 1) by Grassmann, Hermann Ernst (1909). available in print
- Projektive geometrie der ebene, unter benutzung der punktrechnung (Volume 2) by Grassmann, Hermann Ernst (1909). available in print