1. See, for example, the computerized graphic superimposition made by Hammomd and Walker (1984).
2. There are few exceptions, such as the analysis of McHarg Brandywine Valley Plan done by O'Riordan and Turner (1983, pp. 143–145).
3. See, for example, Dansereau (1976, pp. 22–23 and 266–267).
4. Local farmer's experience of soils combined with reconnaissance soil survey for land use planning—an example from Tanzania;Acres;Soil Survey Land Evaluation,1984