Freshwater ecoregions of North AmericaRobin Abell, David M. Olson, Eric Dinerstein, Patrick Hurley, James T. Diggs, William Eichbaum, Steven Walters, Wesley Wettengel, Tom Allnutt, Colby J. Loucks, Prashant Hedao · First published 1999Open the Tome
Terrestrial ecoregions of North AmericaTaylor H. Ricketts, Eric Dinerstein, David M. Olson, Colby J. Loucks, William Eichbaum, Dominick DellaSalla, Kevin Kavanagh, Prashant Hedao, Patrick Hurley, Karen Carney, Robin Abell, Steven Walters · First published 1999Open the Tome
