This is Perl module Geography::JapanesePrefectures.
INSTALLATION
Geography::JapanesePrefectures installation is straightforward. If your CPAN shell is set up, you should just be able to do
% cpan Geography::JapanesePrefectures
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
DOCUMENTATION
Geography::JapanesePrefectures documentation is available as in POD. So you can do:
% perldoc Geography::JapanesePrefectures
to read the documentation online with your favorite pager.
Tokuhiro Matsuno