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Download a PDF of "Guidance for Cost Estimation and Management for Highway Projects During Planning, Programming, and Preconstruction" by the National Academies of Sciences, Engineering, and Medicine for free.
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Stored only when both papers are in the corpus — 74 citations exist upstream.
Papers that cite the same references — the relational fallback while embeddings are still backfilling.
Imported from OpenAlex (CC0) — nothing here is generated.