Economic map of the northwestern portion of Seward Peninsula, Alaska / 
Collier, A. J.(Arthur J.)
Julius Bien & Co.
Washington, D.C. :  [Department of the Interior, 
1902]
In spite of title map only indicates types of sand & gravel in which gold may be and is unlikely to be found.
In: United States Geological Survey. Professional Paper. No. 2. Pl. 11.