As an audiobook, this seminal John Muir work is not terribly thrilling, as it mostly consists of repeated rapturous praise of the Sierra Nevada landscape, detailing its flora and fauna in detail, which can be hugely boring to listen to. Nonetheless, in a broad sense this work is fascinating, and offers insights into Muir's outlook and personality. Narrator Praetzellis has a pleasing voice, but like the book he reads it is often monotonous, not to say soporific. For the most part his pronunciation of all the scientific terms is admirable, though there are a few slips (like twice pronouncing the word 'lichen' -- normally pronounced 'LIKE-en') -- as 'LITCH-en'. All the same he manages to create a believable, even attractive, voice for Muir, though the latter was originally from Scotland and he is British. As this is a free public-domain book, I recommend it.