This is the 16005th most frequent Russian word.
псковские
"Pskovskie" refers to something related to Pskov, a city or region in Russia.
Here, 'псковские' is an adjective describing the souvenirs as originating from Pskov.
Я купил псковские сувениры.
I bought souvenirs from Pskov.
In this case, 'псковские' qualifies the exhibits as being associated with or originating from Pskov.
Музей представил псковские экспонаты.
The museum presented exhibits from Pskov.
Here, 'псковские' specifies the architectural monuments' location or origin as being connected to Pskov.