Antarctic Data Directory System

* 1guidebook of data related to the Antarctic
2ADDS
English Related Words* 12-tone system
* abo blood group system
* abo system
* absolute stability of a system
* absolute system
* absolute system of electrical units
* absolutely stable system
* abstract data type
* accelerated cost recovery system (acrs)
* accentual system
* access to announcing system via ic user stations
* account data
* accounting data
* accounting system
* activating system