Rather than manually add terms to my approx 1500 nodes, is there a way to programatically add a term to a specific node by node type (e.g add term "item" to nodes of type "page")? Alternatively is there a module that might assist with bulk addition of terms?

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Have you tried Views Bulk Operations? It allows you to bulk edit/set fields of specific nodes (you can filter your view by node type). 

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Have you tried Views Bulk Operations? It allows you to bulk edit/set fields of specific nodes (you can filter your view by node type). 

You can also use feeds.

You would need some sort of import file... this could be a list of node ID's or titles, then add the Terms

If the Nodes have multiple Terms you can use Feeds Tamper and "Explode" the term.

This will also create new Terms if they don't exist.

@DrAlbany - I think that is beyond my expertise - I have 1500 nodes and I don't understand how a feed of all nodes from my site could be imported back into the site with new terms attached and without duplicating content...