[OHM] Ancient coastlines and rivers for the Netherlands

[todd.d.robbins at gmail.com]

I just saw this in my feed and it reminded me of the efficacy of having the
major time period tilesets. Anyhow, really neat work:

https://twitter.com/JohanAhlfeldt/status/581547176192409600

-- 
Tod Robbins
Digital Asset Manager, MLIS
todrobbins.com | @todrobbins <http://www.twitter.com/#!/todrobbins>
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