1. Ecoregions, Levels III and IV, Indiana: Indiana
2003. A. Woods, J. Omernik, S. Brockman, T. Gerber, W. Hosteter, And S. Azevedo and Indiana Geological Survey. The following is excerpted from the metadata for OHIN_ECO: "The ecoregions shown here have been derived from Omernik (1987) and fr refinements of ...