domain rankings sudden drop

Hi,
For the past few months we have been ranked on the first page for
several terms.
e.g.
galway hotels - 2nd - 5th google.ie - http://galwayhotels.ebookireland.com/

dublin hotels - 5th 8th - google.ie - http://dublinhotels.ebookireland.com/

Over the past few days we have begun to disappear of google results
pages and not sure why. Can anyone shed any light on this?

Tks

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