[{"title":"(3个子文件4.17MB)自然哲学的数学原理英文原本","children":[{"title":"djvu绿色阅读器.rar <span style='color:#111;'>499.66KB</span>","children":null,"spread":false},{"title":"UniversityofCaliforniaPress-Newton,I.-MathematicalPrinciplesofNaturalPhilosophyandHisSystemoftheWorld,Vol.2;TheSystemoftheWorld(1934).djvu <span style='color:#111;'>1.51MB</span>","children":null,"spread":false},{"title":"UniversityofCaliforniaPress-Newton,I.-MathematicalPrinciplesofNaturalPhilosophyandHisSystemoftheWorld,Vol.1;TheMotionofBodies(1934).djvu <span style='color:#111;'>2.22MB</span>","children":null,"spread":false}],"spread":true}]