The essay The Land Ethic in Leopold's book Sand County Almanac (1949) points out that although throughout history women and slaves have been considered property, all people have now been granted rights and freedoms.
Essees „Maa eetika” („The Land Ethic”), mis ilmus raamatus „Sand County Almanac” (1949) toob ta välja, et kuigi ajaloos on naisi ja orje koheldud kui omandit, on nüüd kõigile inimestele antud õigused ja vabadused.