Badillo, Shaira R.  <br/><br/>
Creating and comparing egg shell chalk and dura-smooth polar bear commercial chalk in terms of writing and physical qualities on illustration board. 

 - Marikina City  March 2019 
 - viii, 36pages;  illustration;   28cm 
<br/><br/> Includes: references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1. Egg shells -- Case studies
<br/><br/><label>LC Class. No.: </label>TT 896.7  / B34 2019