Steamboat Bill (1940-2009; Vols. 1-66) and PowerShips (2010; Vol. 67), East Providence, R.I.: Steamship Historical Society of America.

The number preceding of the slash (/) indicates the issue number; the number or numbers following the slash indicate the page number(s). Starting with issue 273 in 2010, Steamboat Bill changed its name to PowerShips.

US and Canadian official numbers have been added for many of the entries; Canadian official numbers are followed by a "C", as in "152649-C". Other identifiers are also added at times.