Historical clue formulations

• Covers a lot, in a way — 2020-11-04
• Covers up mud, in a way — 2009-04-05
• Surfaces — 2008-07-03
• Blacktops — 2008-02-04
• Blacktops, say — 2008-01-29
• Gets concrete results? — 2002-06-02
• Makes concrete? — 2000-09-15
• Asphalts — 1995-04-21
• Smooths the way — 1995-03-12
• Blacktops — 1994-03-17