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sedmitza.ru
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"Ляпунов Прокопий Петрович" [Lyapunov Prokopy Petrovich]. interpretive.ru (in Russian). НАЦИОНАЛЬНАЯ ИСТОРИЧЕСКАЯ ЭНЦИКЛОПЕДИЯ. Archived from the original on November 6, 2021. Retrieved 2021-11-04.
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"ПАТРИАРХ ГЕРМОГЕН И ПРОКОПИЙ ЛЯПУНОВ" [Patriarch Hermogene and Prokopy Lyapunov]. Церковно-Научный Центр "Православная Энциклопедия" (in Russian). Archived from the original on June 20, 2020. Retrieved 2021-11-07.
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