In some contexts, "Blue Grammar" might refer to other resources: The Blue Book of Grammar and Punctuation : A popular English grammar and punctuation guide.
While a typical A1 textbook explains the Nominative case in 10 pages, the Blaue Grammatik dedicates 50 pages to the entire case system, including rare exceptions. It covers every aspect of German syntax, from complex sentence brackets ( Satzklammer ) to the nuanced use of the Subjunctive II ( Konjunktiv II ) for polite requests. Blaue Grammatik Pdf
If you manage to acquire a legitimate digital copy, expect the following structure: In some contexts, "Blue Grammar" might refer to