Historical clue formulations

• Boy Scouts founder Robert ___-Powell — 2017-04-07
• When doubled, a spa city — 2012-08-08
• European spa site — 2012-07-15
• When repeated, a resort near the Black Forest — 2010-09-26
• Black Forest resort — 2008-10-31
• ___-Württemberg (Stuttgart's state) — 2007-08-04
• ___-Powell (Boy Scouts founder) — 2005-06-17
• Former German state — 2005-03-25
• Former German state — 2001-06-23
• *European resort — 1997-05-01
• When doubled, a German city — 1996-11-06
• German spa city — 1996-06-01
• German spa — 1996-05-12