Longridge, Cecil Clement,  1852- <br/><br/>
Gold dredging and mechanical excavators : annual suppl., 1906 / 
Cecil Clement Longridge 
 - London:  Charles Griffin ,  1904 
 - xi, 67 p. :  ill.;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gold dredging