Historical clue formulations

• Bill ___, noted Vietnam War-era activist — 2021-02-25
• Bill of the 1960s-'70s Weather Underground — 2016-12-03
• Australia's ___ Rock — 2014-01-24
• ___ Rock (Australian site) — 2013-05-20
• Australia's ___ Rock — 2010-03-14
• ___ Rock (Aussie landmark) — 2009-05-10
• ___ Rock (Australian tourist site) — 2000-07-11
• Australia's ___ Rock — 2000-02-06
• Australia's ___ Rock — 1997-09-11
• Classic advertising annual — 1997-03-07
• Australia's _____ Rock — 1995-12-16
• _____ Rock (Australian tourist site) — 1994-12-25
• _____ Rock, Australia — 1994-12-08