Tsūkō ichiran (通航一覧) is a mid-19th century Japanese compilation of documents or "survey of intercourse" related to the foreign relations of the Tokugawas and the Tokugawa shogunate.
[1] These documents, descriptions and commentary encompass Japanese bilateral and international relations; and the work has been parsed into sections by country across 350 volumes.
[2] The purpose of this project was to develop a policy guide based on two and a half centuries of diplomatic precedents.
[1] For example, Daiyūin tono ojikki (Chronicle of Shogun Iemitsu) by Narushima Motonao (1778-1862) is cited; and one referenced excerpt presents an arguably convincing analysis: The text was reprinted in moveable type and published in eight volumes in 1912–1913.
The twenty-three volume appendix on coastal defenses, Tsūkō ichiran zokushū, was published at the same time.