MD Amphibian and Reptile Atlas Grid
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资源简介：
This shapefile contains the outline of each Breeding Bird Atlas block for the entire state. A "block" is the basic unit of data collection for the Maryland/DC Breeding Bird Atlas, a cooperative project of MD DNR and the MD Ornithological Society. A block is defined as one-sixth of a USGS 7.5 minute quadrangle: the quad is halved vertically and cut into thirds horizontally.
创建时间：
2025-07-22
