DECLARED COVERAGE BLIND SPOT
written by a person · artifact 2026-07-27/v2-bridge-k5 · SHA-256 73847f8ff535e7d2…Literature before about 1970 thins out sharply
Measured on 2026-07-27: OpenAlex holds roughly 1.38M works published in 1980, 1.05M in 1970, but only 305K in 1950 — about a fifth of the 1980 density. Historical analyses become progressively less trustworthy the further back they reach, and an apparent gap in older literature may simply be an unindexed one.
- coverage severity
- partial
MEASURED CONTEXT
- works 1980
- 1,383,251
- works 1970
- 1,051,187
- works 1950
- 304,575
This is a sourced, human-curated entry or a declared project limitation. It is not a computed discovery or an actionable hypothesis.