Certain text formats, for example Postscript (extension .ps) and Adobe Acrobat (extension .pdf) specify exactly the page layout of the printed document. The commonly used paper format is different in America and the rest of the world. America uses the "Letter" format, while the rest of the world uses the "A4" format This means that documents formatted on one continent may not be printable on another continent. This memo gives advice on how to produce documents which are equally well printable with the Letter and the A4 formats. By using the advice in this document, you can put up a document on the Internet, which recipients can print without problem both in and outside America.
In plain text format: http://www.ietf.cnri.reston.va.us/rfc/rfc2346.txt
In HTML format: http://dsv.su.se/jpalme/ietf/pdf-postscript-printing.html