The book "Collection of Unpublished Documents Relating to the Discovery, Conquest and Organization of the Former Spanish Overseas Possessions. Volume 10, Legislative Documents, Part III" is a concise but important source for understanding the history of Spanish colonization. This book contains documents that regulated the laws and regulations related to the organization and management of the Spanish colonies. Readers will have the opportunity to learn about legal acts and norms that influenced the lives of people in the colonies and shaped their socio-economic system. Each document offers a new perspective on the history of the formation of the Spanish Empire and recounts important events and decisions that were crucial to the colonial system.