Historical clue formulations

• Stories in installments — 2019-10-07
• Stories to be continued — 2018-02-14
• Radio's "The Lone Ranger" and others — 2013-04-03
• "Buck Rogers" and others — 2012-05-30
• They appear in installments — 2010-10-22
• Soaps, e.g. — 2004-01-28
• Installment plans? — 2000-12-15
• Many Dickens stories, originally — 1994-02-15