What you want is the Congressional Record, 40th Congress, 2nd Session; House of Representatives, Executive Document Number 99. Usually shortened by collectors to Executive Document 99. Likely only available only at the Library of Congress of National Archives. HOWEVER, if you would be content with the parts that refer mostly to ordance purchases, this has been reprinted by Man At Arms Books (Andrew Mowbray Publishing, Rhode Island). The title of the book is "Civil War Arms Purchases and Deliveries."