For a unique historical perspective, you can view the declassified CIA translation of the diary, which includes their contemporary analysis of the guerrilla movement.

Many historical archives and educational websites host PDFs of the diary, often including the introduction by Fidel Castro, which was famously leaked in the 1960s.

He records his own illness (asthma) and the harsh terrain that hampered their operations.

If you are a student or researcher, institutional repositories like JSTOR, Internet Archive (Open Library), or university library networks often hold digital loans of English translations (such as those by Patrick Camiller or those published by Grove Press).

The entries detail his frustrations with the local Communist Party of Bolivia (PCB) and the difficulty of recruiting local peasants who remained wary of the foreigners.

He selected Bolivia for its strategic location in the heart of South America, bordering five nations. Guevara believed that establishing a successful guerrilla foco (base) in the Bolivian jungle would act as the catalyst for a sweeping revolution across the Southern Cone, ultimately challenging U.S. hegemony in the region.