Inscription
lower left in graphite: OKTP; lower center in graphite: Passenger Pigeon; lower right in graphite: Susan Middleton 2008; lower right verso in graphite by unknown hand: Middleton: Passenger Pigeon OKTP
lower left in graphite: OKTP; lower center in graphite: Passenger Pigeon; lower right in graphite: Susan Middleton 2008; lower right verso in graphite by unknown hand: Middleton: Passenger Pigeon OKTP