http://book.klll.cc/ebooks/subject/9961.opds2025-08-19T20:49:37ZBooks about Harmonic analysis (sorted by popularity)Free eBooks since 1971.Project Gutenberghttps://book.klll.ccwebmaster@gutenberg.orghttps://book.klll.cc/gutenberg/favicon.ico2512025-08-19T20:49:37Zhttps://book.klll.cc/ebooks/29779.opdsAn Elementary Treatise on Fourier's Series and Spherical, Cylindrical, and Ellipsoidal HarmonicsWilliam Elwood Byerly