(This report compares revenues provided by different land uses to the costs of servicing those lands; the categories are residential, commercial/industrial, and farm/forest lands)
This file shows graphs with results from cost of community service studies in 11 Georgia counties done over the past few years. The above report has more details of how to interpret these graphs.
Protecting Farmland in Developing Communities: A Case Study of the Tax Implications of Conservation Easements (another pretty long report)