The Office of Treaty Settlements' Healing the past, building a future (The Red Book) is a practical guide to the negotiation and settlement of historical grievances under the Treaty of Waitangi. It also sets out an overview of the historical background to Treaty grievances and settlements, and explains how settlement policy has developed. https://www.govt.nz/assets/Documents/Red-Book-Healing-the-past-building-a-future.pdf.
The New Zealand Government's History, culture and heritage page has links to Treaty of Waitangi claims and Treaty of Waitangi settlement documents, https://www.govt.nz/browse/history-culture-and-her... Individual Iwi settlement documents can be found at https://www.govt.nz/treaty-settlement-documents.