Erban, L., S. Balogh, Dan Campbell, AND H. Walker. An R Package for Open, Reproducible Analysis of Urban Water Systems, With Application to Chicago. Open Water Journal. Brigham Young University, Provo, UT, 5(1):26-40, (2018).

Campbell, Dan, H. Walker, AND H. Lu. Emergy Evaluation of the United States, U.S. Education, Educational Attainment and the National Financial System from 1950 through 2016. Emergy Synthesis 10. The 10th Biennial Emergy Research Conference, Gainesville, FL, January 24 - 27, 2018.

Erban, L., S. Balogh, H. Walker, AND Dan Campbell. Tracking flows of water through a complex urban system: Chicago. Sixth Interagency Conference on Research in the Watersheds, Shepherdstown, West Virginia, July 23 - 26, 2018.

Erban, L., S. Balogh, H. Walker, Dan Campbell, AND T. Gleason. Assessment of the urban water system with an open, reproducible process applied to Chicago. Joint Conference of ISIE and ISSST, Chicago, IL, June 25 - 29, 2017.

Campbell, Dan, H. Walker, S. Balogh, L. Erban, R. Boumans, AND T. Gleason. Change and transition in urban systems: The story of Chicago told with Energy Systems Language models. The International Society for Ecological Modelling Global Conference 2017, Jeju, Jeju, SOUTH KOREA, September 17 - 21, 2017.

Harris, L., R. Murphy, R. Woodland, R. Sabo, K. Eshleman, H. Walker, AND D. Liang. Climate, Clams, and a Changing Watershed: A time series analysis to quantify the impact of management and climate on water quality in the Potomac Estuary. Coastal and Estuarine Research Federation (CERF) 24th Biennial Conference, Providence, RI, November 05 - 09, 2017.

Boumans, R., Dan Campbell, L. Erban, S. Balogh, H. Walker, AND T. Gleason. Thermodynamics and the evolution of a city: a tale of how Chicago came to be, from biophysical and socio-economic perspectives. U.S. Regional Association of the International Association for Landscape Ecology Annual Meeting, Baltimore, MD, April 09 - 13, 2017.

Campbell, Dan, H. Walker, M. Mainelli, AND F. Pulselli. Can Better Accounting and Finance Methods Chart a Path toward a More Sustainable World System? Frontiers in Energy Research. Frontiers, Lausanne, Switzerland, , n/a, (2016).

Kreakie, B., K. Hychka, J. Belaire, E. Minor, AND H. Walker. Internet-Based Approaches to Building Stakeholder Networks for Conservation and Natural Resource Management. ENVIRONMENTAL MANAGEMENT. Springer-Verlag, New York, NY, 57(2):345-354, (2016).

Tenbrink, M., G. Foley, J. Hunter, H. Walker, AND R. Eric. NARRAGANSETT-3VS MODEL OVERVIEW (Information Sheet). U.S. EPA Office of Research and Development, Washington, DC, EPA/600/F-16/060, 2016.

Rashleigh, B., H. Walker, T. Gleason, M. Abdelrhman, L. Charlestra, E. Dettmann, Peg Pelletier, S. Hale, G. Thursby, N. Detenbeck, D. Keith, S. Rego, S. Robinson, J. Grear, S. Ayvazian, AND M. Mazzotta. Quantitative Models for the Narragansett Bay Estuary, Rhode Island/Massachusetts, USA. International Society for Ecological Modelling (ISEM), Baltimore, MD, May 08 - 12, 2016.

Hychka, K., B. Kreakie, J. Belaire, E. Minor, AND H. Walker. Internet-Based Approaches to Building Stakeholder Networks for Conservation and Natural Resource Management. Finger Lakes Research Conference: Threats to the Finger Lakes, Geneva, NY, November 12, 2015.

Rashleigh, B., H. Walker, T. Gleason, M. Abdelrhman, L. Charlestra, E. Dettmann, Peg Pelletier, S. Hale, G. Thursby, N. Detenbeck, D. Keith, S. Rego, S. Robinson, J. Grear, S. Ayvazian, AND M. Mazzotta. Quantitative Models Describing Past and Current Nutrient Fluxes and Associated Ecosystem Level Responses in the Narragansett Bay Ecosystem. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-15/174, 2015.

Campbell, Dan, H. Lu, AND H. Walker. Relationships among the energy, emergy, and money flows of the United States from 1900 to 2011. Canada & United States Societies for Ecological Economics (CANUSSEE) Joint Biennial Conference, Vancouver, CANADA, October 01 - 04, 2015.

Buchholtz ten Brink, M., J. Fiksel, B. Dyson, G. Foley, I. Heilke, M. Hoagland, A. Bassi, P. Bradley, E. Ruder, S. Yee, W. Berry, H. Walker, AND J. Hunter. Bringing Systems Thinking into Community-based Environmental Management. Presented at 2014 Conference on Earth System Governance, Norwich, UK, July 01 - 03, 2014.

Campbell, Daniel Elliot, H. Lu, AND Henry Allen Walker. Relationships Among the Energy, Emergy, and Money Flows of the United States From 1900 to 2011. Frontiers in Energy Research. Frontiers, Lausanne, Switzerland, 2(41):1-31, (2014).