John Densmore has property/houses in Malibu, Topanga Canyon and Santa Monica and a business address at: 9595 Wilshire Blvd., Ste 1020, Beverly Hills, Ca., 90212; Robbie Krieger has a house in Beverly Hills and uses the same business address.
They have signed the book "The Doors" by Hyperion Press published in 2006. It's often available online and on Ebay.
Look for the ones signed by Ray, Robbie, and John. I bought mine a year ago with authentication.