Shale-gas Clip Art at Clker.com - vector clip art online, royalty free & public domain

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<!-- Size: 140 px -- >
<a href="/cliparts/c/l/X/S/g/6/shale-gas-th.png"><img src="/cliparts/c/l/X/S/g/6/shale-gas-th.png" alt='Shale-gas clip art'/></a>

<!-- Size: 340 px -- >
<a href="/cliparts/c/l/X/S/g/6/shale-gas-md.png"><img src="/cliparts/c/l/X/S/g/6/shale-gas-md.png" alt='Shale-gas clip art'/></a>

<!-- Size: 640 px -- >
<a href="/cliparts/c/l/X/S/g/6/shale-gas-hi.png"><img src="/cliparts/c/l/X/S/g/6/shale-gas-hi.png" alt='Shale-gas clip art'/></a>