If you look at the link below (scroll down two pages for the last page of the index), it says "Bogen 11. und 12. (Schluss)", ending with p. 178 (which is the second page of the ordre de bataille and last page of the edition).

Inside the journal, the table of contents to Schönhals' essay follows after page 178. It also ends with the ordre de bataille, giving as page number falsely 174, whereas page 176 would be correct. But no more Beilagen anywhere

Probably (I haven't checked it) the publication of Schönhals' essay in Streffleur's Österreichische militärische Zeitschrift began in 1873 and ended in 1874, and therefore the book title gives 1873 as the date of publication.