Jennings, W.M. <br/><br/>
Percussion drilling rigs and tools for shallow water wells 

 - London  The Technical Press  1934 
 - xii,91p. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Tools, drilling
<br/><br/><label>Dewey Class. No.: </label>622.23  / J41P