https://www.studyingjapaneseswords.com
There is a very-knowledgeable lady who posts on the Nihonto Message Board to discuss her Web-site, https://www.studyingjapaneseswords.com. She has a lot of useful information for those of you who are interested in learning about how Nihonto evolved.
Ken Goldstein
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Judo Kodansha/MJER Iaido Kodansha/Jodo Oku-iri
Fencing Master/NRA Instructor
"A positive attitude may not solve all your problems, but it'll annoy enough people to be worth the effort."