File:Domestic US airline fare yields, 1955 and 1975.png
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Summary
This is never-copyrighted material. It is a graph from a document produced in the United States in 1976 without a copyright and thus public domain. See: https://en.wikipedia.org/wiki/File:Copyrightterm.pdf
The url link below takes you to the graph. The hdl link takes you to the front page in the same document - no copyright assertion on that or the next page.
Simat, Helliesen & Eichner, Inc. (January 1976). "Exhibit 6". An Analysis of the Intrastate Air Carrier Regulatory Forum (Report). Vol. 1. hdl:2027/ien.35556029279486.{{cite report}}: CS1 maint: multiple names: authors list (link)
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:01, 5 August 2024 | | 1,995 × 1,504 (314 KB) | Enplaned (talk | contribs) | This is never-copyrighted material. It is a graph from a document produced in the United States in 1976 without a copyright. See: https://en.wikipedia.org/wiki/File:Copyrightterm.pdf The url link below takes you to the graph. The hdl link takes you to the front page in the same document - no copyright assertion on that or the next page. {{cite report|title=An Analysis of the Intrastate Air Carrier Regulatory Forum|author=Simat, Helliesen & Eichner, Inc.|date=January 1976|volume=1|section=Ex... |
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