User blog:JonathanMarkoff/Secretary of the Interior of the United States (just to see it)

The United States Secretary of the Interior is the head of the United States Department of the Interior. The Department of the Interior oversees such agencies as the Bureau of Land Management, the United States Geological Survey, and the National Park Service. The Secretary also serves on and appoints the private citizens on the National Park Foundation board. The Secretary is a member of the President's Cabinet and is eighth in the presidential line of succession.

While the Department of the Interior hasn't been front and center in Harry Turtledove's work, he has been known to make fictional use of it.

Southern Victory
The Secretary of the Interior was among the higher officials in charge of the United States' secret project to build a superbomb during the Second Great War.