Q1: Volume 3 part 1 (a.k.a. volume 3A) has been digitized and reissued as a paperback by Cambridge UP, see Amazon. The digital version is online in the HathiTrust digital library, but with limited "search only" access because of copyright restrictions. Quite likely you may find a "pirated" version online, but these would be the legal options.
Carlo Beenakker
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