Shunga

I picked up a couple of Japanese Shunga (aka ukiyo-e) books at an antiquarian book fair. I’m trying to figure out how to catalog them. There is zero publication information as it is all block prints in an accordion style fold out book. There is a title on the outside cover. We’ve been able to translate the first word which is Spring. It’s my understanding that’s a euphemism for sex. The seller didn’t provide much info. We assume that it’s early 20th century possibly older. Is there a proper way to catalog something like this?