No. 3,991 in Russian
калининградской
"Kaliningradskoy" refers to something related to Kaliningrad, a city and region in Russia.
In a sentence
Я купил книгу в Калининградской библиотеке.
I bought a book in the Kaliningrad library.
This usage of "Калининградской" is an adjective in the prepositional case, describing the library (feminine noun) being located in Kaliningrad.
Мы посетили Калининградскую область во время отпуска.
We visited the Kaliningrad region during our vacation.
Here, "Калининградскую" is an adjective in the accusative case, modifying "область" (region) and describing it as related to Kaliningrad.
История Калининградской области интересна и самобытна.
The history of the Kaliningrad region is interesting and unique.
In this sentence, "Калининградской" is an adjective in the genitive case, associated with "области" (of the region) and indicating possession or relation.
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