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These are reprint editions reprinted with the help of original book just to give the original look and feel we do not change its format and text due to which in some cases the text is not like new. About The Book: **A Treatise on Special or Elementary Geometry** by Edward Olney is a comprehensive textbook covering the foundational principles of plane, solid, and spherical geometry, along with plane and spherical trigonometry. Designed for high school and college-level students, the book emphasizes clear explanations, practical problem-solving, and logical reasoning. It includes essential geometric constructions, proofs, and theorems, as well as trigonometric functions, identities, and applications. Supplemented by necessary tables, Olney’s work bridges elementary and advanced geometry, making complex topics accessible to learners. His structured, pedagogical approach established the book as a standard text in 19th-century mathematics education in the United States. About The Author: Edward Olney (1827–1887) was a prominent American mathematician and educator known for his influential textbooks in algebra, arithmetic, geometry, and trigonometry. Born in Saratoga County, New York, he was a descendant of Thomas Olney, a co-founder of Providence, Rhode Island. Olney served as a professor at the University of Michigan, where he championed accessible mathematics education. His widely used books—such as *Introduction to Algebra*, *The Complete Algebra*, *A University Algebra*, and *A Treatise on Special or Elementary Geometry*—provided structured and progressive learning for students at various levels. Olney's work shaped 19th-century mathematics instruction in American schools and colleges. The Title 'A Treatise on Special or Elementary Geometry: Including Plane, Solid, and Spherical Geometry, and Plane and Spherical Trigonometry, with the Necessary Tables written/authored/edited by Edward Olney', published in the year 1876. The ISBN 9789373168739 is assigned to the Pape