"David K. Backus" . . "David K." . . "Backus, David K." . _:B210a770f28326cf2795534faaaaf6b6e . . "Backus" . "Backus, David" . . _:B210a770f28326cf2795534faaaaf6b6e . _:B210a770f28326cf2795534faaaaf6b6e . _:B210a770f28326cf2795534faaaaf6b6e "2023-05-20"^^ . _:B210a770f28326cf2795534faaaaf6b6e . _:B210a770f28326cf2795534faaaaf6b6e . _:B210a770f28326cf2795534faaaaf6b6e "106916637" . _:B210a770f28326cf2795534faaaaf6b6e . _:B210a770f28326cf2795534faaaaf6b6e . _:B210a770f28326cf2795534faaaaf6b6e .