Related Clues:
- South 40, say
- Spread units
- Arnold the Pig's were green
- Farm size measure
- The 40 of 'the back 40'
- "The lower 40" units
- There are 640 in a square mile
- Plot measurement
- Units of farmland
- "Land for sale" sign word
- 'Green ___' of 1960s TV
- Parking assignments
- Farmer's measures
- Property measurement
- Back 40 units