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Grouped by what each filing is, not just when it landed. Straight from EDGAR, free, no login. Back to NSC · Search inside filings
The fiscal-year statement table from these filings’ XBRL, one row per year with its source and date: XLSX · CSV
Annual and quarterly reports
Source: the SEC’s own EDGAR submissions record for CIK 0000702165. Forms we do not recognise are left out rather than filed into the wrong group, so a category count is a count of what we could classify, not necessarily of everything ever filed.