What can go here:
Dictionaries
Grammar books
Textbooks
Instructional books
Reference books
etc



WIKI:
Catalan (autonym: català, for pronunciation see below), known in the Valencian Community and Carche as Valencian (autonym: valencià), is a Western Romance language. It is the official language of Andorra, and an official language of three autonomous communities in eastern Spain: Catalonia, the Balearic Islands and the Valencian Community, where it is called Valencian. It has semi-official status in the Italian comune of Alghero, and it is spoken in the Pyrénées-Orientales department of France and in two further areas in eastern Spain: the eastern strip of Aragon and the Carche area in the Region of Murcia. The Catalan-speaking territories are often called the Països Catalans or "Catalan Countries". The language evolved from Vulgar Latin in the Middle Ages around the eastern Pyrenees. Nineteenth-century Spain saw a Catalan literary revival, culminating in the early 1900s.

- "Because the two differ only in minor respects (details of pronunciation, vocabulary, and verb conjugation) and are easily mutually intelligible, most linguists and the Valencian Academy of Language regard Valencian and Catalan to be different names for the same language." - Catalan language | History, Grammar & Dialects - Britannica