Yakataga beach placers

Thompson, Arthur G. | Engineering Index Backfile | 1915

The Klondike placers

Engineering Index Backfile | 1897

Placers of Antioquia, Colombia

Perry, Ralph W. | Engineering Index Backfile | 1915

Dredging of James Creek Cinnabar placers

Patton, P. | Engineering Index Backfile | 1944

Gold placers dredging operations in California

Martin, A.H. | Engineering Index Backfile | 1909