Related Clues:

• Century parts (Abbr.)
• 2013 and 2014, e.g
• Revolutions, perhaps: Abbr
• Century divs
• 1999 and 2015, for short
• Millennium divs
• Spas that last 52 wks
• Many mos
• Decade tenths: Abbr
• Soph. and jr
• 52-wk. units
• Parts of some library call nos
• 19-Across units: Abbr
• 1520 and 2015, e.g.: Abbr
• Timeline parts: Abbr