*1:See eg. 市川市観光協会「自然観察園・バラ園」http://www.ichikawa-kankou.jp/entry.html?id=91904 「大町自然観察園(長田谷津)」https://garden-vision.net/garden_visit/oomatisizen_k.html
*2:See also https://sumita-m.hatenadiary.com/entry/2020/11/10/100137 https://sumita-m.hatenadiary.com/entry/2020/11/19/125114 https://sumita-m.hatenadiary.com/entry/2020/11/25/065352See also https://sumita-m.hatenadiary.com/entry/2020/11/10/100137 https://sumita-m.hatenadiary.com/entry/2020/11/19/125114 https://sumita-m.hatenadiary.com/entry/2020/11/25/065352