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Title: Boyé, Martin Hans to William Parker Foulke
Description: Description of assistant needed to complete Geological Survey report.
Subject: Geology--Pennsylvania; Geological Survey of Pennsylvania
Date: 1851-02-24

Title: Foulke, William Parker to Martin Hans Boyé
Description: Line item estimate of costs and requirements for completion of the Geological Survey.
Subject: Geology--Pennsylvania; Geological Survey of Pennsylvania
Date: 1851-02-22

Title: Frazer, John Fries to William Parker Foulke
Description: Geological Survey. See also Booth, James C.
Subject: Geology--Pennsylvania; Geological Survey of Pennsylvania; Science and Technology
Date: 1851-02-12

Title: Foulke, William Parker to John Fries Frazer
Description: Encloses letter from Prof. Booth. Geological Survey. See also Booth, James C.
Subject: Geology--Pennsylvania; Geological Survey of Pennsylvania; Science and Technology
Date: 1851-02-12

Title: Foulke, William Parker to John W. Guernsey
Description: Geological Survey of Pennsylvania
Subject: Geology--Pennsylvania; Geological Survey of Pennsylvania; Science and Technology
Date: 1851-04-10