1. Callicott JB (2022) Three project ideas to fill research gaps in Aldo-Leopold scholarship. Socio Ecol Pract Res 4(1). https://doi.org/10.1007/s42532-021-00102-6
2. Leopold A (1939/1991) A biotic view of land. In: Flader SL and Callicott JB (eds) (1991) The river of the mother of God and other essays by Aldo Leopold. University of Wisconsin Press, Madison, pp 266–273 (First published in 1939, Journal of Forestry, 37:727–730)
3. Leopold A (1942/1949) Odyssey. In: Leopold A (1949) A sand county almanac and sketches here and there. Oxford University Press, New York, pp 104–108 (First published in 1942, Audubon Magazine, 44 (3):133–135)
4. Leopold A (1949) A sand county almanac and sketches here and there. Oxford University Press, New York
5. Likens G (2013) Biogeochemistry of a forested ecosystem, 3rd edn. Springer, New York