Railroad Archives Online
- ArquivoE0485 - Great Northern Railway Historical Society Railroad Forms Collection
- Série001 - Burlington Northern Railroad Company
- Subsérie006 - Business Correspondence
- ItemBNform10012-Envelope5x11.5 - Burlington Northern Form 1001, Envelope, undated
- ItemBNform10016-Envelope6.5x9.5 - Burlington Northern Form 1001, Envelope, undated
- ItemBNform12201-NotePad5.25x7 - Burlington Northern Form 12201, Notepad, undated