File:Underground River At Marble Arch, Ireland By E. A. Martel.jpg
Cropped from a page on archive.org from the following document:
(1897). "British Caves and Speleology". The Geographical Journal X (5): 500–511. Retrieved on 24 July 2012.
Author
E. A. Martel
Licensing
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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