This is the 8520th most frequent Russian word.
новоселовского
"Новоселовского" refers to something related to "Novoselov" (a surname or place) in the possessive form.
Here, 'новоселовского' acts as an attributive adjective formed from the proper noun 'Новоселовское' to denote something belonging to or originating from 'Новоселовское', modifying 'художника' (artist).
Мы посетили новоселовского художника, чьи работы выставлены в местной галерее.
We visited the Novoselovskoe artist, whose works are exhibited in the local gallery.
In this sentence, 'новоселовского' serves as an adjective describing 'района' (district), indicating a relation to Novoselovskoe.
Новоселовского района власти приняли решение о строительстве новой школы.
The authorities of the Novoselovskoe district made a decision about building a new school.
The word 'новоселовского' functions as an adjective related to 'леса' (forest), associating it with Novoselovskoe or indicating the forest named as such.