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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Tight crop to show observatory name. The original can be viewed here: Sign for Cascades Volcano Observatory on Open day 2005 (USGS).jpg: . Modifications made by Carcharoth (Commons).

This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy. Bahasa Indonesia ∙ català ∙ čeština ∙ Deutsch ∙ eesti ∙ English ∙ español ∙ français ∙ galego ∙ italiano ∙ Nederlands ∙ português ∙ polski ∙ sicilianu ∙ suomi ∙ Tiếng Việt ∙ Türkçe ∙ български ∙ македонски ∙ русский ∙ മലയാളം ∙ 한국어 ∙ 日本語 ∙ 中文 ∙ 中文（简体） ∙ 中文（繁體） ∙ العربية ∙ فارسی ∙ +/−

This image is a derivative work of the following images:

• File:Sign_for_Cascades_Volcano_Observatory_on_Open_day_2005_(USGS).jpg licensed with PD-USGov-USGS
  • 2010-04-11T04:15:44Z Carcharoth (Commons) 1200x900 (1208291 Bytes) {{Information |Description=Sign for Cascades Volcano Observatory (Vancouver, Washington State, USA) on Open day 2005. |Source=[http://vulcan.wr.usgs.gov/Volcanoes/MSH/OpenHouse2005/Images/index.html CVO Open House, May 21, 20

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