Historical clue formulations

• What some titles are written in, briefly — 2010-05-30
• Titles are often written in them, briefly — 2006-11-08
• Biased writing?: Abbr. — 1997-12-09
• W.W. II Axis members: Abbr. — 1997-07-06
• Some type: Abbr. — 1994-07-24