Basement Facts and Their Sources

This page lists each public document our pages rely on, grouped by topic, with its publisher, its title, and its check date. We list a document only when we read it on the publisher's own page. Where a government text sits on another host, such as the federal flood policy at Cornell's Legal Information Institute, the entry names that host.

You see 7 source types here: government agencies, statutes and codes, public data files, standards bodies, insurance-industry research, university guides, and a civic association. One equipment statement comes from a manufacturer, and we name it as the maker's claim. Competitors, marketplaces, directories, and forums are never sources for a fact on this site.

We set a recheck date for each document by how its record changes. Agency pages carry dates through 2027, Maryland statutes through October 2027, Census files through December 2027, and climate normals through 2031. A source that fails a recheck comes off the page that used it.