The paper is so thin that it lets the ink on the other side. When reading a page, the characters on the following page are perfectly visible, you can read upside down. This significantly hinders reading. Blank spaces left between titles and texts are disfigured by these blackish lines, are extended to a trail signs down to the end of the page. Object of great ugliness to a text that deserved better. "You gave me your mud and I made gold". There, it is the opposite. Under these conditions impossible to assess the relevance of the file accompanying the text.
