Hokusen nikō Rashin Yūki no genjō oyobi taisaku (shiken)
Subtitle: tsuketari Seishin-kō kangen mondai ni taisuru genchi kōsatsu
By: Okazaki Hirobumi
Publisher: Okazaki Hirobumi]
Published: 1940
Place of publication: [Dairen?
Language: jpn
Number of pages: 165
Subjects: Harbors; History
Notes: Issued as confidential document.