Conic Sections: Treated Geometrically and, George Bell and Sons Educational Catalogue

W. H.Besant

《Conic Sections: Treated Geometrically and, George Bell and Sons Educational Catalogue》，W. H.Besant。这是一部关于科学、文学、经典的公版作品，适合在安静的片刻里慢慢读下去。