Saving our farms and our Documentary evidence

Last Saturday the Dominion Post newspaper and others published this full page advertisement from the Save the Farms group.  The issue of foreign ownership is big in New Zealand right at the moment.

At the moment our largest export commodity depends on farms, and therefore it is an issue for exporters and international trade since foreign owners may not wish to continue to use the land in the same way.  The big question is do we want to protect our golden goose and keep the proceeds in NZ. 

But there is also the issue for information specialists of how do we in the future find the documentary evidence within our media - is it likely that this particular advertisement will be indexed?  What are we doing about this?