Simplified schematic of the MAP database. The boxes on the left represent the tables that make up the bibliographic dataset. They are linked to the survey tables represented by the central boxes in Figure 1 and these are in turn linked to the site tables represented by the box on the right of the Figure. A full list of fields within the survey and site tables that are available for download is given. A subset of example fields from the bibliographic tables is given within the boxes on the left.