斯多摩

零不只是沒有 by: 哈利,斯多摩; 斯多摩 (Language materials, printed)

圓 / by: 喬治.烏斯帝; 斯多摩; 漢聲雜誌 (Language materials, printed)

直線、線段、多邊形 = Lines, Segments, Polygons / by: 哈利.斯多摩; 斯多摩; 漢聲雜誌; 羅伯特.奎肯布希(Robert Quckenbush) (Language materials, printed)

直線.線段.多邊形 / by: 斯多摩; 漢聲雜誌; 羅伯特.奎肯布希 (Language materials, printed)