Holland, Philip W. <br/><br/>
A mass spectrometer method for determining helium in the parts-per-million to 10-percent range / 
by Philip W. Holland. 
 - Washington, D.C. :  U.S. Dept. of the Interior, Bureau of Mines,  [1991] 
 - 8 p. :  ill. ;  28 cm. 
 - Report of investigations ;  9359 .
 - Report of investigations (United States. Bureau of Mines ;  9359. .
<br/><br/>Includes bibliographical references (p. 8). 
<br/><br/><label>LCCN: </label>90027339  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine gases--Analysis.<br/>Helium--Measurement.<br/>Mass spectrometry.
<br/><br/><label>LC Class. No.: </label>TN23  TN305  / .U43 no. 9359 
<br/><br/><label>Dewey Class. No.: </label>622/.82