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Ov Box 1

 Container

Contains 7 Results:

Early Intake Gatestructure Concrete Details and Tail Race Pipe Line blueprints, 1924

 File — OV: Box 1, Folder: 3
Identifier: Subseries 1_2:
Dates: 1924
Found in: California Historical Society / MS 980, William W. Helbush collection of water project records / Hetch Hetchy water supply project records / Project records / Early Intake Tail Race Pipe Line

Corral Hollow Pipe Line blueprints, 1931

 File — OV: Box 1, Folder: 4
Identifier: Subseries 1_2:
Dates: 1931
Found in: California Historical Society / MS 980, William W. Helbush collection of water project records / Hetch Hetchy water supply project records / Project records / Corral Hollow Pipe Line

Main Aqueduct, Foothill Division, blueprints and Red Mountain Bar Siphon Wasteway blueprints, 1929-1932

 File — OV: Box 1, Folder: 5
Identifier: Subseries 1_2:
Dates: 1929-1932
Found in: California Historical Society / MS 980, William W. Helbush collection of water project records / Hetch Hetchy water supply project records / Project records / Hetch Hetchy Aqueduct, Foothill Division, Red Mountain Bar Siphon

Main Aqueduct, Foothill Division, Red Mountain Bar Siphon radial gate blueprints, 1932

 File — OV: Box 1, Folder: 6
Identifier: Subseries 1_2:
Dates: 1932
Found in: California Historical Society / MS 980, William W. Helbush collection of water project records / Hetch Hetchy water supply project records / Project records / Hetch Hetchy Aqueduct, Foothill Division, Red Mountain Bar Siphon

Main Aqueduct, Mountain Division and Coast Range Division, blueprints, 1918, 1925-1931

 File — OV: Box 1, Folder: 7
Identifier: Subseries 1_2:
Dates: 1918, 1925-1931
Found in: California Historical Society / MS 980, William W. Helbush collection of water project records / Hetch Hetchy water supply project records / Project records / Hetch Hetchy Dam and Aqueduct, Coast Range Division and Mountain Division

Mile Rock Sewerage Tunnel, Alameda Creek-Arroyo Honda Tunnel, and Hetch Hetchy Railroad blueprints, 1915-1922

 File — OV: Box 1, Folder: 1
Identifier: Subseries 1_1:
Dates: 1915-1922
Found in: California Historical Society / MS 980, William W. Helbush collection of water project records / Hetch Hetchy water supply project records / General records

Hetch Hetchy water supply project blueprints, 1926-1929

 File — OV: Box 1, Folder: 2
Identifier: Subseries 1_1:
Dates: 1926-1929
Found in: California Historical Society / MS 980, William W. Helbush collection of water project records / Hetch Hetchy water supply project records / General records

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