. _:B778916bef317a790dc7699cf5125e540 . . "Robert K. Ritner" . "Ritner" . . "2021"^^ . "Robert K." . "1953"^^ . "Ritner, Robert Kriech" . "Ritner, Robert K. (1953-2021)" . _:B778916bef317a790dc7699cf5125e540 . _:B778916bef317a790dc7699cf5125e540 . _:B778916bef317a790dc7699cf5125e540 "2023-05-22"^^ . _:B778916bef317a790dc7699cf5125e540 . _:B778916bef317a790dc7699cf5125e540 . _:B778916bef317a790dc7699cf5125e540 "297456148" . _:B778916bef317a790dc7699cf5125e540 . _:B778916bef317a790dc7699cf5125e540 . _:B778916bef317a790dc7699cf5125e540 .