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USA National Phenology Network
June 21, 2016
The USA-NPN's new Phenology Maps allow you to see how much heat has accumulated in particular regions of the US, find out how this year's spring stacks up to previous years, and more! Now you can view video tutorials to help you explore the maps of growing degree days and the Spring Indices.
This beautifully illustrated guide provides detailed information on stems, buds, roots, leaves, flowers and fruits to help you make your Nature's Notebook observations. Download a free copy of the Primer, or purchase a spiral-bound copy.