U.S. Chemical Safety and Hazard Investigation Board

Investigation reports, safety studies and videos are free on csb.gov; links open the investigation page, where the report PDF is offered.

CSB’s licence or reproduction terms allow the first pages of each document to be indexed here, so they are searchable as well as the title and summary.

US federal government work, in the public domain in the United States; this site indexes the first pages and links to the CSB's own copies, hosting no publisher download files.