Agena, W. F.
Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey : For sale by USGS Information Services (Open-File Report Sales), 2000.
2000
Agena, W. F.
[Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey : For sale by USGS Information Services (Open-File Report Sales), 2001.
2001