Lexington is selling a book as a memento of its tercentennial observances. Copies of “We Are Lexington — Celebrating 300 Years” are expected to be available starting Nov. 1, and will cost $39. The 104-page book will feature more than 800 photographs from the events and projects involved in the nine-month celebration that started in September 2012, according to Jessie Steigerwald, a member of the town’s 300th Anniversary Celebration Committee. Orders can be placed online at www.lexington300.org, or arranged through the town clerk’s office. Full story for BostonGlobe.com subscribers.