The Geographic Names Information System (GNIS) contains information about almost 2 million physical and cultural geographic features in the United States.
A step-by-step guide to conducting topical, geographic, and keyword searches of MRIB; viewing and refining search results; and exporting the results in several formats.
Overview of hydrologic unit maps adapted from USGS Water-Supply Paper 2294 giving description of hydrologic units, link to list of hydrologic units, paper maps and digital spatial data sets.
An introduction to three related USGS digital libraries: the general-purpose Marine Realms Information Bank (MRIB); the regionally focused Monterey Bay Science (MBS) Digital Library; and the topically focused Coastal Change Hazards (CCH) Digital Library.