19 C.F.R. § 201.10

As appropriate, notice of the receipt of documents properly filed, of the institution of investigations, of public hearings, and of other formal actions of the Commission will be given by publication in the Federal Register. In addition to such publication, a copy of each notice will be posted at the Office of the Secretary to the Commission in Washington, DC, and, as appropriate, copies will be sent to press associations, trade and similar organizations of producers and importers, and others known to have an interest in the subject matter.