Tropical timer 

 -  1967 
<br/><br/><label>Standard No.: </label>1,945 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ECONOMICS
<br/><br/><label>Dewey Class. No.: </label>X9JA.18, K7 (906)