Describir: The influence of the envelope in the preventive conservation of books and paper records : Case study: Libraries and archives in La Plata, Argentina

 _    _     ______    _  _      ___                _____    _____       ___    
| \  / ||  /_   _//  | \| ||   / _ \\    ____     |  ___|| |  __ \\    / _ \\  
|  \/  ||   -| ||-   |  ' ||  / //\ \\  |    \\   | ||__   | |  \ ||  / //\ \\ 
| .  . ||   _| ||_   | .  || |  ___  || | [] ||   | ||__   | |__/ || |  ___  ||
|_|\/|_||  /_____//  |_|\_|| |_||  |_|| |  __//   |_____|| |_____//  |_||  |_||
`-`  `-`   `-----`   `-` -`  `-`   `-`  |_|`-`    `-----`   -----`   `-`   `-` 
                                        `-`