| Description of the ecoregions of the United States RG Bailey US Department of Agriculture, Forest Service, 1995 | 1443 | 1995 |
| Ecosystem geography: from ecoregions to sites RG Bailey Springer Science & Business Media, 2009 | 1261 | 2009 |
| Ecoregions RG Bailey New York, 1998 | 823 | 1998 |
| Description of the ecoregions of the United States RG Bailey Forest Service, US Department of Agriculture, 1978 | 688 | 1978 |
| Delineation of ecosystem regions RG Bailey Environmental management 7, 365-373, 1983 | 639 | 1983 |
| DISTINGUISHING BETWEEN WATERSHEDS AND ECOREGIONS1 JM Omernik, RG Bailey JAWRA Journal of the American Water Resources Association 33 (5), 935-949, 1997 | 477 | 1997 |
| Ecoregions of the United States: 1995 RG Bailey US Department of Agriculture, Forest Service, 1994 | 455 | 1994 |
| Ecoregions of the United States. RG Bailey | 431 | 1976 |
| National hierarchical framework of ecological units DT Cleland, PE Avers, WH McNab, ME Jensen, RG Bailey, T King, ... Ecosystem management applications for sustainable forest and wildlife …, 1997 | 404* | 1997 |
| Identifying ecoregion boundaries RG Bailey Environmental management 34 (Suppl 1), S14-S26, 2004 | 305 | 2004 |
| Explanatory supplement to ecoregions map of the continents RG Bailey Environmental Conservation 16 (4), 307-309, 1989 | 284 | 1989 |
| Chemistry and biochemistry of herbage. GW Butler, RW Bailey | 269* | 1973 |
| Ecoregion-based design for sustainability RG Bailey, L Ropes Springer, 2002 | 195 | 2002 |
| Soil slips related to vegetation, topography, and soil in southern California RM Rice, ES Crobett, RG Bailey Water Resources Research 5 (3), 647-659, 1969 | 191 | 1969 |
| 1994 RG Bailey, PE Avers, T King, WH McNab Ecoregions and subregions of the United States (map)(supplementary table of …, 1993 | 166 | 1993 |
| Suggested hierarchy of criteria for multi-scale ecosystem mapping RG Bailey Landscape and Urban Planning 14, 313-319, 1987 | 160 | 1987 |
| Ecoregions of the United States (map) RG Bailey Ogden, UT: US Department of Agriculture, US Forest Service, Intermountain Region, 1976 | 157 | 1976 |
| Nature of land and resource classification--a review RG Bailey, RD Pfister, JA Henderson Journal of Forestry 76 (10), 650-655, 1978 | 155 | 1978 |
| Ecological regionalization in Canada and the United States RG Bailey, SC Zoltai, EB Wiken Geoforum 16 (3), 265-275, 1985 | 154 | 1985 |
| A world ecoregions map for resource reporting RG Bailey, HC Hogg Environmental conservation 13 (3), 195-202, 1986 | 133 | 1986 |
