While they are not solely focused on distributed systems, these five books -- https://rvprasad.medium.com/books-about-designing-systems-of-scale-295a7a91997c ht

While they are not solely focused on distributed systems, these five books -- https://rvprasad.medium.com/books-about-designing-systems-of-scale-295a7a91997c https://rvprasad.medium.com/books-about-designing-systems-of... -- cover different aspects of designing systems of scale, which are most often distributed systems.