Sources
Public Source Base
Periodic Engine uses public source categories for mineral facts, critical-material context, policy signals, and scientific references.
Source Directory
USGS
United States Geological Survey
Mineral production, reserves, import reliance, and commodity context.
DOE
U.S. Department of Energy
Critical materials, energy relevance, and technology exposure.
IEA
International Energy Agency
Energy transition minerals and demand signals.
EU_COMMISSION
European Commission
Critical and strategic raw materials context.
PUBCHEM
PubChem
Element facts and chemical references.
NIST
National Institute of Standards and Technology
Scientific reference data.
RSC
Royal Society of Chemistry
Element education and public chemistry references.
WORLD_BANK
World Bank
Commodity and macroeconomic context.
BIS
Bureau of Industry and Security
Export controls and trade policy signals.
OFAC
Office of Foreign Assets Control
Sanctions and restricted-party context.