This document, now in its third edition, is a comparision report to the T-AGG report Assessing Greenhouse Gas Mitigation Opportunities and Implementation Strategies for Agricultural Land Management in the United States. The third edition updates the side-by-side comparision of the biophysical greenhouse gas mitigation potential of 42 agricultural land management activities with newly available and previously unincluded data from field experiments, modeling, and expert review. Activities with sufficient research estimates of mitigation potential are now all derived from original individual data points of side-by-side experiments (previous editions included expert and modeling estimates and applied different weighting factors).