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https://infotributaria.com/2020/01/13/sunat-%e2%9c%94%ef%b8%8f-cronograma-de-libros-electronicos-2020-tipo-a-y-b-registro-de-compras-y-ventas/
SUNAT ✔️ Cronograma de Libros Electrónicos 2020 [Tipo A y B] Registro de compras y ventas