Official History of the Russo-Japanese War (Naval and Military) (London: HMSO). Three volumes and Vol. II Maps in a big case, published between 1910 and 1922 or thereabouts. Hard to find, I have only Vol. II & Maps. Very expensive. I was offered a complete set for $4,000 about 20 yrs. ago. Facsimile edition published in India,2015. Got it through Alibris. Books mentioned on this site are good. There are other books, but not as good. Also several books by Russians (Semenov, Klados, Novikof-Priboy).