Primary Sources
Every source is logged with provenance in research/sources/sources-log.md. The archive currently focuses on official records and contemporaneous newspapers.
Core Repositories
USPTO — patent records and filings.
Utah Digital Newspapers — page scans for local reporting.
Library of Congress: Chronicling America — national newspaper scans (most hits are unrelated and under review).
National Archives — federal records relevant to REA activity.
Current Status
We have a large corpus of UDN and LOC page scans. The highest-likelihood UDN pages are being verified manually for direct citations.