The use of a handheld programmable calculator to determine the explosibility of mine atmospheres and gas mixtures 
Smith, G.E. 
 - Washington  Department of interior  1977 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CONTROL DE LAS CONDICIONES AMBIENTALES<br/>RIESGOS DE EXPLOSION
<br/><br/><label>Universal Decimal Class. No.: </label>622.87