Book recommendations for Sengoku provinces

Hi,

I'm looking for any suggestions folks might have for books displaying
detailed maps of the Sengoku provinces. Such maps hopefully show
major (and minor) settlements, fortresses and castles, rivers and
other prominent topography. The map(s) provided with the game system
are in my view, while helpful as a start, rather lacking in detail.
I've found some maps along the lines of what I'm looking for in some
of the Osprey books (i.e. Sekigahara, Kawanakajima, Nagashino, etc.),
but I was really hoping to find yet more detail over a larger area if
possible. I'm even open to primary sources in the original Japanese
if anyone knows of such books by name. Thanks,

Paul