Historical clue formulations

• Common recyclable — 2023-10-03
• Common recyclable — 2020-07-16
• Common recyclable — 2019-08-28
• Tab holder, e.g. — 2018-12-01
• Container typically with a pull tab — 2018-10-15
• Coke source — 2013-12-05
• Pop-top spot — 2010-09-03
• Crush holder that's crushable — 2008-05-16
• Where to find pop art? — 2008-02-22
• Recyclable item — 2001-08-08
• Recycling candidate — 2000-09-22