Tōa gojūmanbun no ichi zu /
Japan.Rikuchi Sokuryōbu.
[Tokyo] : Sanbō Honbu,
Taishō 12-Shōwa 19 [1923-1944]
Relief shown by contours, form lines, gradient tints, and spot heights.
Sheets use 2 different numbering systems.
Some sheets overprinted with military information.