The book Early History of the Colonial Post Office by Mary Emma Woolley is an important source for studying the development of the postal system during the colonial period in the United States. The author examines in detail the emergence and development of postal services in colonial settlements, their impact on communication between the colonies and the mainland, as well as on strengthening the unity of the newly formed territories. The book reveals interesting facts related to the organization and functioning of the postal system in the difficult conditions of the colonial period, highlights key events and personalities that influenced its further development. Thanks to the analysis of historical documents and materials, the author reveals the essence and importance of postal services in the formation and development of colonial settlements.