I have found and continue to find the links below extremely useful:
https://www.translate.com/japanese-english
https://markussesko.files.wordpress.com/2015/04/nihontocompendium-e1.pdf
https://nihontoantiques.com/project_category/sold_wakazashi/
https://m.youtube.com/watch?v=z9l9dgEEaPw
https://www.ebay.com/itm/266018581718
https://buyee.jp/item/yahoo/auction/r1070365900?lang=en
https://www.samurai-nippon.net/SHOP/O-413.html
https://eirakudo.shop/token/tachikatana/detail/607676
https://swordsofjapan.com/product/naokazu-tanto/
https://www.aoijapan.net/wakizashi-mutsu-daijyo-miyoshi-nagamichi-3/
https://www.nipponto.co.jp/swords8/KY334671.htm
http://drdeanhartley.com/ColHartley/Oriental/ArmsAndArmor.htm#Other_Owari_Schools_
https://new.uniquejapan.com/a-masamitsu-katana-former-tachi-nbthk-juyo-token/
https://www.samuraishokai.jp/sword/22148.html
https://www.toukenkomachi.com/index_en_tachi&katana_A060821.html
http://www.nihonto.us/NAMIOHIRA%20YASUTSUNA.htm
https://thejapanesesword.com/archive_newsletters.php
https://buyee.jp/item/yahoo/auction/x1054727912?conversionType=item_browsing_history
https://nihontoclub.com/smiths/SUK893
https://www.militaria.co.za/nmb/forum/6-for-sale-or-trade/
https://nihonto.com/a-brief-study-of-bizen-blades-of-the-muromachi-era/
http://www.nihonto-museum.com/
http://www.ksky.ne.jp/~sumie99/togi