Arbor Recovery Protocol (ARP) is a tactical apparatus for the recovery, observation, and long-term maintenance of trees displaced by redevelopment. Through a network of Field Offices, living specimens and their associated records are brought into continuous processes of stabilization, assessment, and care. Field studies, imaging surveys, maintenance logs, recovery reports, and observational analyses accumulate alongside the collection. These materials serve as instruments for registration and evaluation, supporting both intervention in the present and the extension of institutional memory over time. Public installations provide temporary access to selected specimens and records while ongoing operations continue.