haʊˈɛvɚ, bɪkˈʌz ʌvðə pɹˈæktɪkˈælᵻɾiz ʌv kəmpˈaɪlɪŋ ðɪ ˈɪndɛks bˈɪldɪŋ ˌɔn pɹˈiːviəsli pˈʌblɪʃt sˈoːɹsᵻz
However, because of the practicalities of compiling the index (building on previously published sources)