At this time we are registring the books of the library of the Astronomical Institute into databasis (Tinlib) of the main library of the Faculty of mathematics and physics of Charles University (MFF UK). Books in this databasis can be found with Telnet and WWW. There you can find books from all libraries of MFF UK, so it is necessary to find out the shelf reference of the book. The shelf reference indicates the place where the book is filed. The shelf reference of our library is ASTR.