http://nla.gov.au/nla.obj-2964286903
Bailey, Robert G & Cushwa, Charles T & Crowley, J. M & Geological Survey (U.S.). National Mapping Division & Eastern Energy and Land Use Team. (1981). Ecoregions of North America, after the classification of J.M. Crowley Retrieved January 28, 2023, from http://nla.gov.au/nla.obj-2964286903
Bailey, Robert G, Cushwa, Charles T, Crowley, J. M, Geological Survey (U.S.). National Mapping Division and Eastern Energy and Land Use Team. Ecoregions of North America, after the classification of J.M. Crowley Reston, VA: The Survey, 1981. Web. 28 January 2023 <http://nla.gov.au/nla.obj-2964286903>
Bailey, Robert G & Cushwa, Charles T & Crowley, J. M & Geological Survey (U.S.). National Mapping Division & Eastern Energy and Land Use Team. 1981, Ecoregions of North America, after the classification of J.M. Crowley The Survey, Reston, VA viewed 28 January 2023 http://nla.gov.au/nla.obj-2964286903
{{Citation
| author1=Bailey, Robert G.
| author2=Cushwa, Charles T.
| author3=Crowley, J. M.
| author4=Geological Survey (U.S.). National Mapping Division.
| author5=Eastern Energy and Land Use Team.
| title=Ecoregions of North America, after the classification of J.M. Crowley
| year=1981
| scale=Scale 1:12,000,000.
| section=1 map : col. ; 74 x 56 cm.
| location=Reston, VA
| publisher=The Survey
| url=http://nla.gov.au/nla.obj-2964286903
| id=nla.obj-2964286903
| access-date=28 January 2023
| via=Trove
}}
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