Show HN: An interactive map of the 1M most-assigned books in college syllabi

This is absolutely fantastic. I rather enjoy learning about new subjects by going through the textbooks prescribed for University courses, so to have all of this at my fingertips... I am just giddy with excitement that this exists.

It would be nice to see which year level a textbook belongs to (Unless I'm not seeing this feature) For example, if I want to learn about Psychology but know nothing about it, I'd rather be reading books from a Year 1 University course rather than reading a book that already assumes prior knowledge on the subject.

But the hunting is part of the fun for me, too. This is an autodidacts dream.