Libo-on, John Patrick  <br/><br/>
Producing a hydrophopic envelope from the used paper of the Senior High School Department of Our Lady of Perpetual Succor College. 

 - Marikina City. 
 - vi, 75pages;   illustration;  28cm 
<br/><br/> Includes: references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1. Waste paper -- Recycling -- Case studies
<br/><br/><label>LC Class. No.: </label>TS 1120.5  / I52 2019