I just released an update for BiblioCraft for Minecraft v1.12.0. This is pretty much a straight port from the previous version. This is more of a beta than previous releases though since it is missing one recipe, the recipe to turn an atlas into an enchanted atlas for the death compass. I also expect this build of BiblioCraft to break in future version of forge for Minecraft v1.12.0, so that is something to be aware of as you update forge and such at this early junction in Minecraft v1.12.x modding.
Minecraft 1.12 introduced a new recipe system which now uses json files that can easily be edited by anyone. From what I understand, Minecraft v1.13 will introduce data-packs which are essentially resource packs that support a bunch more types of thing, such as recipes. So this was the first big step toward that and all the recipes in BiblioCraft are now in the new json format. Forge is still in the process of making back-end changes to better support all this new stuff. Some of the changes proposed in forge are expected to break current compatibility, so that is why I expect some things to break in the future. But as that happens I plan to try to stay on top of updating to support forge as it goes through changes.
Anyway, head on over to the download pages to grab the newest version of BiblioCraft. If you have any comments, questions, or issues, feel free to post on the website, the official minecraft forum, or create an issue on github. For bugs and stuff, creating an issue on github is most preferred. As always, enjoy!