. "Perkowski, Jan L." . . . "Perkowski, Jan Louis" . "Jan L. Perkowski" . _:B4074d21b9c009a3660c88f22790fa4a1 . . "Perkowski" . "Jan L." . _:B4074d21b9c009a3660c88f22790fa4a1 . _:B4074d21b9c009a3660c88f22790fa4a1 . _:B4074d21b9c009a3660c88f22790fa4a1 "2023-05-20"^^ . _:B4074d21b9c009a3660c88f22790fa4a1 . _:B4074d21b9c009a3660c88f22790fa4a1 . _:B4074d21b9c009a3660c88f22790fa4a1 "087266539" . _:B4074d21b9c009a3660c88f22790fa4a1 . _:B4074d21b9c009a3660c88f22790fa4a1 . _:B4074d21b9c009a3660c88f22790fa4a1 .