"The River of Time" (first published in 1981 as "Coexistence" in Isaac Asimov's Science Fiction Magazine)*
"ðə ɹˈɪvɚɹ ʌv tˈaɪm" fˈɜːst pˈʌblɪʃt ɪn nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi wˈʌn æz "kˌoʊɛɡzˈɪstəns" ɪn ˈaɪsək ˈæzᵻmˌɑːfz sˈaɪəns fˈɪkʃən mˌæɡɐzˈiːn ˈæstɚɹˌɪsk