The Library of Congress put those on their own web site about 8 years ago.
Yea...several hours after posting, I realized that "Newly Released......" was a mis-statement...however I don't think this interesting collection has been widely publicized. For those interested in the technique used to capture and then 100 yrs later to digitize these photos, here is a link to the Library of Congress....http://www.loc.gov/exhibits/empire/making.html
The ability to expose three plates, especially of people, with "slow" plate emulsion and get crisp images is amazing..or I am just easily amazed..:>)
I remember reading up on that photographer when the exhibit first opened. At the time, I wondered if maybe he shot them by dropping a holder with 3 in-line plates through the back of the camera relatively quickly. I think that's how multiple prints of the same portrait snapshot were made before the negative/paper printing processes matured. You'd still have to make separate exposures, but it minimized the movement of the camera that you'd get from pulling and pushing the plates through one at a time in their own holders. If you look at the shots with moving water, it just seems incredible that he could have done three decent exposures in such rapid succession.
I'd be surprised if there wasn't someone here on LL with voluminous knowledge of those old techniques.