1

1 (from 1 to 1)
10 (from 10 to 10th Mountain Division)
11 (from 11 to 11th Philippine Scout Battalion)
12 (from 12 to 12th Street Riot)
13 (from 13 to 13th Floor Elevators)
14 (from 14 to 14th century in literature)
15 (from 15 to 15th Infantry Regiment)
16 (from 16 to 16VSB)
17 (from 17 to 17th century in literature)
18 (from 18 to 18th Street gang)
19 (from 19 to 19th century Russian Revolutionary Movements)
1_ (from 1,000 Hours to 1-up)
1e (from 1er arrondissement, Paris to 1er arrondissement, Paris)
1s (from 1st Armored Division to 1st Polish Armoured Division)
1x (from 1Xtra from the BBC to 1Xtra from the BBC)