Memoir
A memoir (from the French word mémoire or the Latin memoria, meaning "memory") is a literary genre and a kind of autobiography. A person who writes memoirs can be called a memoirist. An autobiography tells the story of a life, while a memoir tells a story from a life, such as touchstone events and turning points from the author's life.
Memoir Media
Title page of Henry Thoreau's memoir, Walden (1854)
An excerpt from the manuscript "Memoires on Napoleon's campaigns, experienced as a soldier of the second regiment", written by Joseph Abbeel, 1805–1815.