Millennials and Gen Z may not remember this, but the physical Guia Telefonica Argentina was once a doorstop-sized book. In 2010, Telecom and Telefónica distributed over 8 million copies. By 2020, citing environmental concerns and digital migration, the printed distribution ceased almost entirely.
The most reliable way to find landline numbers and residential addresses is through the official portals of Argentina's main service providers: Movistar Argentina - Guía Telefónica paginas blancas guia telefonica argentina