_:B78f047ea857ae667562bae48297464b1 . "Helen G." . "Stevenson" . "Helen G. Stevenson" . "etser"@nl . . . "Stevenson, Helen G." . . _:B78f047ea857ae667562bae48297464b1 . _:B78f047ea857ae667562bae48297464b1 . _:B78f047ea857ae667562bae48297464b1 "2023-05-19"^^ . _:B78f047ea857ae667562bae48297464b1 . _:B78f047ea857ae667562bae48297464b1 . _:B78f047ea857ae667562bae48297464b1 "285633651" . _:B78f047ea857ae667562bae48297464b1 . _:B78f047ea857ae667562bae48297464b1 . _:B78f047ea857ae667562bae48297464b1 .