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Keywords from Image Description:
Malakoff Diggings North Bloomfield Gravel Mining NYPL bGF B. en Malakoff Diggings North Bloomfield Gravel Mining nypl org Scan by NYPL Malakoff Diggings North Bloomfield Gravel Mining Pacific Coast Views no Gold miners Hydraulic mining Mineral industries Environmental aspects The Miriam and Ira Wallach Division of Art Prints