Japanese Hansatsu

Hi, I've recently been looking into this fascinating currency but haven't been able to find much. I was wondering if anyone has access to or knows about any books or websites that catalog them? Any help is most appreciated

I know nothing about it but there seems to  be a lot in the Numista Literature section.  https://en.numista.com/literature/index.php?r=Japanese+Hansatsu&t=&a=&c=

Thanks, I don't use it much so I completely forgot about the literature section