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

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