Source Websites, Books and Personal Accounts...

Source Websites :

http://www.sakoman.net/pg/html/15308.htm
Nitro Explosives - A Practical Treatise - by F. Gerald Sanford, 1907.
Remarkable Project Gutenberg E-book with details of a variety of high explosives, including excellent descriptions of the batch process units used between 1900 and the late 1930s.

http://www.eugeneleeslover.com/USNAVY/CHAPTER-2-1.html
Smokeless Powder Manufacture
Chemical data on smokeless powder manufacture, notably the ether process for Nitrocellulose (pyroxiline).

http://members.tripod.com/~nigelef/ammo.htm Fantastic artillery cordite site with table of types of cordite and some production information.

http://albumen.stanford.edu/library/monographs/sunbeam/chap07.html Details of pyroxiline, ether and reactions of ether-alcohol solution with water.

http://shakeypete.blogspot.com/2005/06/gunpowder-overview-of-modern-smokeless.html Exactly as it promises.

http://globalsecurity.org/military/systems/munitions/explosives-compositions.htm

http://www.du.edu/~jcalvert/phys/bang.htm
Good on Pyroxiline.

http://www.ukrocketry.co.uk/forum/lofiversion/index.php/t1874.html Hilarious discussion of the history of gunpowder and modern rifle propellant, to assist a fiction writer.