The Winkelman Natural Resources Conservation district stretches from Oracle north to Highway 60 and includes the lower San Pedro River, San Manuel, Aravaipa, Mammoth, Willow Springs and Kearny.

This 2012 Field report contains a broad array of information including archaeology, mines, historic towns and stagecoach stops, ranching, mines, farming and a long list of references.

Source: Main Report PDF and Appendix 9 PDF from Winkelman Natural Resource Conservation District Documents