Related Clues:

• Surveyors' calculations
• Some have codes
• ___ of expertise
• 20, 25, 47 and 53-Across, e.g.
• Bailiwicks
• Purviews
• Shipping areas
• Sectors
• Geometric findings
• Delineated sections
• Calculus calculations
• Provinces
• They may be designated for rest or play
• Sports, Arts & Leisure, etc.
• Subjects of research, e.g.