Northern Pacific Engineering Drawing: Ventilation Motor Rooms, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB025521
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Ventilating Plant, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB025471
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Ventilating Plant, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB025483
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Ventilating Plant, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB025485
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Ventilating Plant, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB025484
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Ventilating Plant, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB025470
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Ventilating Plant, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB025472
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Ventilating Plant, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB025486
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Ventilating Nozzle Change and Details, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB017513
• Item
• undated

Part of Timothy Miller Collection

Northern Pacific Engineering Drawing: Tunnel and Ribs, Mullan Tunnel, Blossburg, Montana, undated

• US WaBuPNRA D0027-004-009-008-008-BB019955
• Item
• undated

Part of Timothy Miller Collection