Historical Landmarks Outer Boundary

Identifies extent of historical resources. It includes all area defined in the original nomination form. -- Additional Information: Category: Zoning Purpose: Define extent of historical resource protection. Update Frequency: As Needed -- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=54667本数据集用于界定历史资源的覆盖范围，涵盖原始提名表中划定的全部区域。-- 附加信息：类别：区划（Zoning）；用途：明确历史资源保护的范围；更新频率：按需更新 -- 元数据（Metadata）链接：https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=54667