Jack Fish Tunnel, Lake Superior Postcard
Jack Fish Tunnel, Lake Superior. Divided-back postcard published by the Valentine & Sons' publishing Co. Numbered 100,521.
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Copyright/Licence: This work was first published in 1964 or earlier, and the author of the work was anonymous. To the best of my knowledge, the author of the work was unknown at the end of the year 50 years after the work was published, meaning that this work would be in the public domain in Canada, per section 6.2 of the Copyright Act. Note also this link. See disclaimers.