I am sorry to say that in your website, I have found an error in this page (http://www.greatsite.com/timeline-english-bible-history/index.html).
The error is that the first metal type printed book is Jikji, not Gutenberg's bible.
Jikji was printed in 1377, which is printed 78 years faster than Gutenberg's bible.
To help your understanding with this matter, I have attached a link (http://www.jikjiworld.net:10000/content/english/jikji/index.jsp?top=01&sub=0&left=01&url=mn010/mn010_010.jsp).
Even though Jikji was printed faster, this fact is not known well throughout the world.
With your help, the fact can be more spread to the others who did not know it.