National Geologic Map Database (NGMDB)
The master catalog of all published US geologic maps — federal, state, academic, and private — with 100,000+ map entries searchable by topic, area, scale,…
Public-domain full text preserved in the Mountain Man Mining Library. Original source: ngmdb.usgs.gov.
National Geologic Map Database (NGMDB) Author: USGS & Association of American State Geologists Year: 2024 Category: Gold Maps The master catalog of all published US geologic maps — federal, state, academic, and private — with 100,000+ map entries searchable by topic, area, scale, and author. Most maps link to free PDFs. Indispensable companion when chasing references in older Professional Papers or state bulletins. Tags: gold, , catalog, database, maps Source: ://.usgs.gov/