A list of available documents related to The History of Middle-earth (and related books: The Letters and The Unfinished Tales, for example, where relevant) by Christopher Tolkien. There is some duplication of information in the following documents; at this time (16 December 2018) there is much more commentary on the plural of Dwarf and Glorfindel in the History of Middle-earth document (that is much more general than the document on the History of The Lord of the Rings). As I have noted this is very much sporadically updated: I very possibly won't update it again any time soon but it's impossible to tell (though at this time I have very much going on in my life so this is even more remarkable).