Pimsleur Downloadables and Physics Subfields

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2 Questions here

1: Anyone know of a place to download Pimsleur audio courses? I bought some but I want audio files for my self-learning collection (wasn't sure what thread to ask this in)

2: I have like 200 physics texts from high school to graduate level. Recently I found out cryogenics was a thing, so I downloaded some books on that. What other subfields of physics are worth adding to the collection? Is there enough texts on biophysics? What other ideas do you guys have?