Historical clue formulations

• 1970s New York City mayor — 2017-12-28
• Big Apple mayor before Koch — 2011-08-17
• Former New York mayor Abe — 2011-05-23
• New York City's first Jewish mayor — 2010-03-26
• 1970s Big Apple mayor — 2009-02-12
• 1970s Big Apple mayor — 2008-07-05
• Former Big Apple mayor Abe — 2004-05-05
• Former New York mayor — 2003-01-30
• See 71-Across — 2001-10-14
• Former Big Apple mayor Abe — 1999-04-06
• Lindsay's successor — 1994-01-09
• Koch's predecessor — 1994-01-04