Essentials of scientific method. 

 -  1925 
<br/><br/><label>Standard No.: </label>54289 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PHILOSOPHY
<br/><br/><label>Dewey Class. No.: </label>R17, F5