ADVERTISEMENT. IX 
Post, W. S. Cook Inlet, region from head of, to Kuskokwim River and down the 
Kuskokwim to Bering Sea, Bristol Bay, and a part of Alaska Peninsula; 
scale, 1:625000. Published in sections in "A reconnaissance in South- 
western Alaska, in 1808." Twentieth Ann. Kept, pt.7, L900, pp. 31-264. 
Reaburn, D. L. The Mount McKinley region; scale, 1:250000. Contained in Pro- 
fessional Paper No. — . 
WrriiERsrooN, D. C. Copper, Nabesna, and Chisana rivers, headwaters of; scale, 
1 : 250000. Contained in "The geology of the central Copper River basin." 
Professional Paper No. 41. 
Seward Peninsula, northeastern portion of, topographic reconnaissance of; 
scale, 1:250000. Contained in "The Gold Placers of the Fairhaven 
District, Seward Peninsula." Bull. No. 247. 
TOPOGRAPHIC MAPS OF ALASKA IN PREPARATION. 
Witherspoon, D. C. The Fairbanks placer district; scale, 1 : 250000. 
Gerdine, T. G. The Nome district; scale, 1 : 02500. 
Hamilton, E. G. The Cook Inlet placer fields; scale, 1 : 250000. 
