Ackermann, Rudolph, 1764-1834. Characteristic Portraits of the Various Tribes of Cossacks Attached to the Allied Armies in 1815, taken from Life, accompanied by Historical Particulars of their Manners, Costumes, &c. London: R. Ackermann, 1820. 24 plates, iv, 52 p.; 4to (37 cm.).

A very interesting 'review':

http://books.google.com/books?id=44dHAAAAYAAJ&pg=PA833&lpg=PA833

Some Ackerman plates from the A. S. K. Brown Collection:

Cossacks in full dress (35 x 25 cm.):

http://dl.lib.brown.edu/catalog/getimage.php?image_id=1234481237171875.jp2

Don Cossacks, officer; private:

http://dl.lib.brown.edu/catalog/getimage.php?image_id=1234481731406250.jp2

Cossacks of Siberia:

http://dl.lib.brown.edu/catalog/getimage.php?image_id=1234481951421875.jp2

Regular Cossacks:

http://dl.lib.brown.edu/catalog/getimage.php?image_id=1234481463265625.jp2