"Diary of the Reduction Expedition of 1780, laid out by order of the Viceroy of Buenos Aires" is an interesting documentary work by the author Francisco Gavino de Arias, which tells the story of an expedition organized to reduce Indian settlements in 1780 in Argentina. In this book, the reader will be able to learn about the life and customs of local tribes, interaction with the colonists, as well as about the difficulties and difficulties that accompanied this expedition. The entries in the diary reflect a unique view of the history of the region and its inhabitants in the second half of the 18th century."