Since a lot of links in this thread are dead, I'm going to try to post most of her photobooks in the next couple of posts. These are the best quality scans I was able to find.
Photobooks/Photo sets 2016-2020
Images are just previews, full sets are in the zips.
Idol Line - Marina Nagasawa (長澤茉里奈) - I'm Crazy About Marichu (まりちゅうに夢中) (2016-07-22)
Some of these are split into multipart zip archives to stay under Bunkr's file size limit. They should all be higher quality than what's been shared previously in this thread. DVDs (except for TSDS-42139) have been re-encoded from the source (existing encodes I found were pretty bad).