This table is rarely, if ever, changed. 

When you start typing in resource information, you will notice the Country field has a drop-down list of options regarding where the resource being entered was published.  The Country of origin can be useful  to point out possible bias of resources regarding a controversal topic.  This list can be adjusted if necessary

Steps for adjusting the GMD list... 

LibCode Suite / Utilities / Setup / Authority Files /  Country... /  click on item and change details or click + to add

1. +  or <F2> to add
2. −  or <F3> to delete
3. √  or <F9> to save changes

Note:

• You have only 3 characters for the Country code
• You have 25 characters for the Description