I don't know much about these. They're big publications, looks like 1 was put out per month, around 350+ pages per magazine/book. They're all in Japanese. It looks like the manga "Girl Friends" was featured in several of these. The stories don't look 100% Shojo-Ai/Yuri but there's definitely a bunch of them.
The full title is "Comic High: Girlish Comics For Boys and Girls". I have a few of them. If anyone thinks they might be interested, I'll list the exact volume #s and such.
Looking to sell @ Fanime, but I can ship if necessary.