Dutch Centre For Field Ornithology (SOVON) - Bird Atlas 1978-1983 - metadata
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资源简介：
The atlas was published in 1987. In the period October 1978 - September 1983 the occurrence of the species was recorded using a grid of 5 x 5 km squares as a geographic unit.The results of this work were combined to form 12 maps per species, one for each month.
创建时间：
2017-01-25
