Why not write business letters in HTML? They can easily be converted to PDF and attached in email. This is a minimalist example to showcase how simple it can be. Click on the HTML link and use View/Source in your browser to see!
Sidenotes are often placed in the outside margin of textbooks, and in the PDF version of document they alternate between left and right side. Figures and tables float to the top and bottom of pages, and wide content extend into margins.
Dictionaries often use multi-column layout to save space, and running headers indicate keyword entries on that page. Notice how each letter is marked on a tab on right pages. The fonts used in the PDF version are Satyr and Faunus, made by Monokrom. Archive.org has a scanned copy of the printed edition from 1910.
Thomas Malthus published his essay on Principles of Population in 1798. At the time, the descending "s" was in fashion and this reconstruction uses the 'text-replace' property to recreate the original printed book (Archive.org has a scanned copy). Also, the document uses ligatures and the Table of Contents is generated with a script.
Project Gutenberg has published Oliver Twist and many other classic titles in HTML. By adding a small style sheet, a PDF file can be created. A small script automatically generates the Table of Contents.
This document reconstructs the first edition of Henrik Ibsen's poetry collection, first published in 1871. His typographers in Copenhagen didn't have all the Norwegian letters in they typecases, so they improvised. The modern-day equivalent is to modify font files, and to hand-code other errors they made. The poems are in Norwegian, but a section in English describes the process.
All PDF documents above are generated with Prince. To make these documents on your own computer, download and install Prince, then run it with command-line aguments. For example: