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https://infotributaria.com/2020/01/02/sunat-%e2%9c%94%ef%b8%8f-obligados-a-utilizar-libros-electronicos-2020-cronograma-tipo-a-y-b/
SUNAT ✔️ Obligados a utilizar Libros Electrónicos 2020 [Cronograma Tipo A y B]