I've been trying to track down information on the sizes of different farms in a historical context.

The closest I've found to anything pre 1980 is...

http://books.google.ca/books?id=vxo7...num=2#PPA24,M1

I'm wondering how large farms should be for periods in, say, the 500ad-1000ad period for...

1. single families out on the frontier - producing enough to support that family
2. a community farm for a primary crop - e.g., community shares field for wheat/potato, then family grows own support vegetables (and how big their garden/farm would be)
3. size for a people to maintain a herd, etc...

Any ideas of where to look?