1.
2.
3.
Norcross, Ga. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : USGS Earth Science Information Center [distributor], 1994.
I 19.76: 93-499 |
4.
San Juan, P.R. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : Earth Science Information Center, Open-File Reports Section [distributor], 1994.
I 19.76: 93-465 |