https://www.nps.gov/articles/000/fgdc_gda_crtheme.htm
FGDC, GDA, and Cultural Resources Theme (U.S. National Park Service)
cultural resourcesnational parkgda
https://archive.epa.gov/esd/archive-nerl-esd1/web/html/wemap_mm_rc_rng120_md_3k.html
EMAP-West Landscape Metrics Metadata (FGDC), EPA
The United States Environmental Protection Agency's Environmental Monitoring and Assessment Program (EMAP) is conducting a study in the western United States....
emapwestlandscapemetricsmetadata
https://www.usgs.gov/media/files/fgdc-csdgm-schema-package
FGDC-CSDGM Schema package | U.S. Geological Survey
u sschemapackagegeologicalsurvey
https://statuschecker.fgdc.gov/
Welcome | FGDC Service Status Checker
service statuswelcomechecker