This is the 9054th most frequent Russian word.
ростова
"Ростова" is the feminine form of "Ростов" and can refer to something or someone from Rostov, a city in Russia.
Here, 'Ростова' is the name of the city Rostov.
Я недавно был в Ростове и посетил исторический музей.
I recently visited Rostov and went to the historical museum.
'ростовской' (related to 'Ростова') characterizes the collection as originating from Rostov.
Этот материал из ростовской коллекции музея.
This material is from the Rostov's museum collection.
Used as the proper noun for the city made adjectival in form.