Co-Digestion of Three Types of Manure (Cow, Guinea Pig and Pig) to Obtain Biogas in Southern Peru Jaime Ernesto Barreda Del Carpio, Midwar R. Ancco Mamani, Alexia D. Nuñez Chambi, Christopher E. Aguirre Gamero, Kevin Tejada Meza, Gustavo M. Pacheco Pacheco 174-181 2022-08-25