M1486 OCR Cache

Machine-extracted OCR text from 48 reels of NARA Microfilm Publication M1486, Records of the Russian Consular Offices in the United States, 1862–1922. Contents: 322 PDF segments, 71,318 pages, packaged as a single SQLite3 database (132 MB). Record types include individual consular files, passport applications and correspondence, money transfer applications, certifications, estate files, draft status inquiries, trade correspondence, and coded telegrams. Consular offices represented: New York, Philadelphia, Chicago, Baltimore, Seattle, Montreal, and others. Format: SQLite3 database with two tables — ocr_cache (one row per page, 71,318 rows) and crop_ocr_cache (higher-DPI re-reads of sub-regions, 13,426 rows). Each row contains the source PDF name, page number, and extracted text. No scores, no indexes, no derived data — raw OCR text only. OCR engine: Apple Vision (macOS on-device), multilingual hint English/Russian/Polish, 150 DPI standard pass, 300 DPI for crop re-reads. Coverage: 48 of 169 reels — reels 25, 37–53, 55–65, 70–77, 79–80, 83. See README for full reel list. Underlying collection: U.S. government work, public domain. NARA Microfilm Publication M1486, filmed 1986, originals repatriated to Russia 1990.