Common Tree Species of the Northwest Forest (BEPA) Betula papyrifera Common Tree Species of the Northwest Forest (BEPA) Common Tree Species of the Northwest Forest (BEPA) Common Tree Species of the Northwest Forest (BEPA) Common Tree Species of the Northwest Forest (BEPA) Common Tree Species of the Northwest Forest (BEPA) white birch Common Tree Species of the Northwest Forest (BEPA) Common Tree Species of the Northwest Forest (BEPA) white birch Common Tree Species of the Northwest Forest (BEPA)