Related Clues:

• Atlas abbr.
• Continental Div., e.g.
• A lot of Colo.
• The Sierras, e.g.: Abbr.
• Holyoke and Sinai, e.g.: Abbr.
• Erstwhile
• High points: Abbr.
• Range: Abbr.
• Churchill and Logan: Abbr.
• See 33-Down
• Chain letters?
• McKinley and Logan, et al (Abbr.)
• Geog. feature
• 64-Across and others: Abbr.
• See 25-Down