Historical clue formulations

• Sound of spring? — 2022-05-11
• Spring report — 2019-07-27
• Comics sound — 2018-12-21
• Spring sound — 2018-06-20
• Cartoon sound — 2014-01-26
• Comics sound — 2013-04-20
• Jumping-on-a-mattress sound — 2013-04-14
• Spring sound — 2011-04-13
• Spring sound — 2009-09-01
• Cartoon sound effect — 2006-03-23
• Spring sound — 2004-06-27
• Sound of a spring — 1999-10-25
• Spring sound — 1999-03-07