sentences:  One was for "extant EVCs" showing vegetation at the time of mapping (i.e.the 1990s), and the other "pre-1750 EVCs", which mapped an expert interpretation of the vegetation classes as they would have been prior to European impact, taken nominally as the year 1750.In 1996 an expert scientific group was established to undertake a peer review of the EVC methodology, concluding that "EVCs provide an important statewide level of vegetation mapping and that EVCs are an appropriate basis for assessing floristic biodiversity conservation".