Hello
According to MoscowHorror´s post:http://forum.farposst.ru/viewtopic.php?t=3164
I uploaded this book:Reports of military observers attached to the armies in Manchuria during the Russo – Japanese war (1906)
You can find there many informations about armies in Manchuria and many plans of Port Arthur fortifications.
Link: http://www.zshare.net/download/port-arthur-rar.html
Language: English
Size: 14,01MB (three separated pdf´s compressed to one RAR file)
Source: Combined Arms Research Library
Enjoy
V.