org/licenses/by-sa/2.0CC BY-SA 2.0 Creative Commons Attribution-Share Alike 2.0 truetrue This image is a derivative work of the following images: Image:Heliograph (1).jpg...
September 2018 English US Forest Service lookout using a Colomb shutter type heliograph in 1912 at the end of a telephone line operator: Flickr described at URL:...
It was copied to Wikimedia Commons using Flickypedia by Heliograph on 28 December 2023. English Three 8th Australian Light Horse signallers...
English British signallers with heliograph at advanced headquarters at Kara Tepe, Mesopotamia, ca. Dec. 6, 1917...
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com/photos/state_library_south_australia/8165962152/ operator: Flickr URL: https://live.staticflickr.com/8062/8165962152_208144f29e_o.jpg determination method: SHA-1...
This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license. You are free: to share – to copy, distribute and transmit...
4 November 2015 operator: Flickr described at URL: https://www.flickr.com/photos/forestservicenw/22141587183 determination method or standard: SHA-1...
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse English...
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