1920s Japanese Rikusentai (“marines”/naval landing forces)?

[Gundamentalist 5.56]

Can anyone point me in the direction of any other sources on Japanese rikusentai other than the following sources:

http://www.geocities.com/dutcheastindies/SNLF.html
http://en.wikipedia.org/wiki/Special_Naval_Landing_Forces
Osprey Men-at-Arms 432: Japanese Special Naval Landing Forces
[/list]

I need to know about the rikusentai in the 1920s, before they were reorganised in the late 1920s and their first major action in Shanghai in 1932.

Other than these leads I’ve drawn pretty much a dead end. Any help would be appreciated. Thanks.