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- www.google.nl/search?q=hts+cables&tbm=isch&tbo=u&source=univ&sa=X&ei=RTyWUp69F8qQ1AWiy4GgDg&ved=0CDkQsAQ&biw=1161&bih=800
- http://et3.nl/images/upload
- /How%20Evacuated%20Tube%20Transport%20can%20help%20in%20meeting%20targets%20of%20Kyoto%20protocol.pdf