Abstract
River works which make use of natural stones and woods and take an enviroment at into consideration are called ‘intimate river works for nature conservation’ and have a tendecy to increase.The work using with brushwoods is one of works that people have not forcused in recent years.Kogykusha Civil Alumni Association Magagine mentions the graduates friendship and the study of works and technologies in Meiji era.There is an essay under the title of ‘Ryushikoushikr’in it.I had like to focus ‘Ryushikoushiki’ and be help to the execution of Ryushikou after this.
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