For intellectual property law reasons accessible only from ZBW reading room.
Total number of images: unknown - currently only findable via the film list.
Material may exist on microfiche. Access is only possible at the Hamburg site of the ZBW - please contact us via the feedback address at the foot of this page.
| Type | Company |
| Location | United States (North America) |
| Industry | Power Industry |
| Holdings | Newspaper clippings: 1971-1986 Annual reports: 1949-1984 |
| includes | Northern Natural Gas Company – 1980 |
| URI | https://pm20.zbw.eu/folder/co/060338 |
| ID | co/060338 |