I believe it is persuasive. You're trying to get people to help preserve the mountains, da? That essay is trying to persuade them
The chapter in The Iroquois Book of Rites contains information about the rules and regulations about of the Iroquois Nation can be found in chapter 6, 'The laws of the league'. When you are reading the book take notes and highlight any important information so that when you go to answer questions you can make references to the highlighted material.
Hope this helps if you have any other questions or would like further explanation just let me know! :)
When writing a text book, it would be necessary to create a step-by-step situation in reference to an instruction manual or handbook. You may need to include cross references as well as a bibliographical index. This type of writing would require a slow pace in order to ensure accuracy and thoroughness of the topic at hand.