Books From Bark
The Mayan people might have been the first people to create books with paper that came from the bark of trees, like how we do it today. To date, there are 3 confirmed codices from the ancient Mayan period, and one more which is still in question.
Obsidian, or volcanic rock.
Just like the Aztecs, the Mayans never used iron or steel. Instead, their weapons were made of obsidian, or volcanic rock.