Astronomy 2 (ingles)

1717. Sagan - Cosmos.pdf                                                          

1718. Ferguson - Astronomy Explained Upon Sir Isaac Newton Principles.pdf         

1719. Rambosson - Astronomy.pdf                                                   

1721. Ostrander - The Planetarium and Astronomical Calculator.pdf

https://mega.co.nz/#!5AZgkaCI!ItZ0DytOp-xy428mCE_hiOYzESOD6YGkJy_hrSAFGm4