| Command ctrs. | 13 |
| Command posts: Abbr. | 20 |
| Operations ctrs. | 16 |
| Mil. command centers | 20 |
| Mil. command bases | 18 |
| Mil. centers | 12 |
| Business home bases, for short | 30 |
| The UN and AOL have theirs in NYC | 33 |
| Sources of orders, briefly | 26 |
| Mil. places | 11 |
| Command posts, for short | 24 |
| Command posts, briefly | 22 |
| Command centers: Abbr. | 22 |
| C.O.'s hangouts | 19 |
| C.E.O.'s places | 19 |
| Bases, briefly | 14 |
| Administration ctrs. | 20 |
| Charlemagne's realm: Abbr. | 30 |
| Charlemagne's domain: Abbr. | 31 |
| Otto I's realm: Abbr. | 25 |
| Otto's realm: Abbr. | 23 |
| Old Eur. domain | 15 |
| Charlemagne's domain (Abbr.) | 32 |
| Abbr. on old maps | 17 |
| Realm of Otto I (Abbr.) | 23 |
| Otto I's domain: Abbr. | 26 |
| It ended in 1806: Abbr. | 23 |
| Charles V's domain: Abbr. | 29 |
| Charlemagne's realm (Abbr.) | 31 |
| 1,000-yr. realm | 15 |
| Realm of Otto I: Abbr. | 22 |
| Dominion until 1806: Abbr. | 26 |
| Dom. of seven Henrys | 20 |
| Charlemagne's reign: Abbr. | 30 |
| Charlemagne's domain, for short | 35 |
| Charlemagne ruled it: Abbr. | 27 |
| Thousand-year dominion (abbr.) | 30 |
| Realm until the 19th cen. | 25 |
| Realm of Otto the Gt. | 21 |
| Realm from 800-1806: Abbr. | 26 |
| Otto I's realm (abbr.) | 26 |
| Otto I's dom. | 17 |
| Much of central Eur., once | 26 |
| Maximilian's realm: Abbr. | 29 |
| Maximilian I's realm: Abbr. | 31 |
| Maximilian I's domain, briefly | 34 |
| It dissolved when Francis II abdicated: Abbr. | 45 |
| Dom. of Otto I | 14 |
| Charlemagne's realm, for short | 34 |
| Charlemagne's dominion: Abbr. | 33 |
| Central Eur. power until 1806 | 29 |
| Bygone Eur. realm | 17 |
| Barbarossa's bailiwick (abbr.) | 34 |
| Subj. covered on the AP European History test | 45 |
| Realm until 1806: Abbr. | 23 |
| Realm that lasted roughly one thousand years: Abbr. | 51 |
| Realm ruled until 1806, for short | 33 |
| Realm from 800-1806 A.D. | 24 |
| Realm ended by Napoleon: Abbr. | 30 |
| Realm destroyed by Napoleon: abbr. | 34 |
| Political div. that ended in 1806 | 33 |
| Otto's dom. | 15 |
| Otto the Great's realm: Abbr. | 33 |
| Otto the Great's domain: Abbr. | 34 |
| Otto I's realm, briefly | 27 |
| Otto I was its first leader: Abbr. | 34 |
| Otho's govt. | 16 |
| Onetime realm of central Eur. | 29 |
| Old Eur. realm | 14 |
| Old dominion: Abbr. | 19 |
| Old domain: Abbr. | 17 |
| Medieval state: Abbr. | 21 |
| Louis I's realm: Abbr. | 26 |
| Longtime Hapsburg domain: Abbr. | 31 |
| Land once ruled by the Hapsburgs: Abbr. | 39 |
| Its spiritual head was the pope: Abbr. | 38 |
| Its leader's flag featured a black eagle: Abbr. | 51 |
| Its flag had a haloed double-headed eagle: Abbr. | 48 |
| Its first emp. was Otto | 23 |
| Its banner was a double-headed eagle: Abbr. | 43 |
| It was dissolved during the Napoleonic Wars: Abbr. | 50 |
| It started at the end of the Dark Ages: Abbr. | 45 |
| It included the Kingdom of Burgundy, initially | 46 |
| It ended when Francis II abdicated: Abbr. | 41 |
| It ended during the Napoleonic Wars: Abbr. | 42 |
| It dissolved in 1806: Abbr. | 27 |
| It began in A.D. 800: Abbr. | 27 |
| It began in A.D. 800 | 20 |
| Initials on maps of old Eur. | 28 |
| Initials in old Europe | 22 |
| Hohenstaufen dynasty realm: Abbr. | 33 |
| Historic Eur. inits. | 20 |
| Hapsburg domain: Abbr. | 22 |
| France/Hungary separator, once: Abbr. | 37 |
| First Reich for short | 22 |
| Eur. realm that ended in 1806 | 29 |
| Eur. political entity once led by Charlemagne | 45 |
| East Francia successor: Abbr. | 29 |
| Dominion ended by Francis II: Abbr. | 35 |
| Domain who legislative body was the Imperial Diet: Abbr. | 56 |