Prussian Instructions:

The Prussian instructions. Rules for the alphabetical catalogues of the Prussian libraries l translated from the 2nd edition, authorized, 1908; with an introduction and notes by Andrew D Osborn. _ Ann Arbor Mich: University of Michigan Press, 1938.  

A committee was appointed to study the Royal Library Code (i.e., the modified Instructions of Dziaztko) to make improvements in the matter of bibliographical description. This resulted in the Prussian Instructions, i.e., Instruktionen fur die Alphabetischen catalogue der Prussian Bibliotheken, published in 1899. Its English translation rendered by A D Osborn was published in 1938. This code represented the German practice which differed from the Anglo-American tradition, at least in two aspects. It prescribed grammatical rather than mechanical title. In title entry, the first grammatically independent word instead of first word (other than article) as opposed to Anglo-American practice, was prescribed. The second major difference was that the code did not accept the concept of corporate authorship. It treated corporate publications as a class of anonymous publications.