An English GrammarThis Excellent e-book of English Grammar is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever.

You may copy it, give it away. or re-use it under the terms of the Project Gutenberg License included. very useful for both teachers and students. 

Can one invention really change the world? Before the mid-fifteenth century, books were printed by hand, making them rare and expensive. Reading and learning remained a privilege of the wealthy--until Johannes Gutenberg developed a machine called the printing press. Gutenberg, a German metalworker, began in the 1440s by making movable type--small metal letters that were arranged to form words and sentences, replacing handwritten letters. Movable type fit into frames on the printing press, and the press then produced many copies of the same page.

Again a graphic novel (oh, c'mon, people! Just a comic!!!) - this time based upon "Lord Jim". Sadly, not so easy to obtain now as a nicely scanned text.
Both the text and audio of the novel, not the comic! are to be found on Gutenberg project here: http://www.gutenberg.org