1. An evaluation of landscape units;Ackerson;PE&RS,1980
2. Large-scale sampling photography for forest habitat-type identification;Befort;PE&RS,1986
3. Wetland classification and mapping in Western Tennessee;Carter;PE&RS,1979
4. Fundamentals of image interpretation;Estes,1974
5. Visual image interpretation in CORINE land cover mapping;Feranec;Phare CORINE Newsletter,1995