USA NPN National Phenology Network

Taking the Pulse of Our Planet

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Uses the USA-NPN Contemporary or Legacy Data

Modeling Lilac Development

Hopp, R. J. Modeling Lilac Development. International Journal Of Biometeorology no. 20. International Journal Of Biometeorology (1976): 256-260.

Phenology: an aid to agricultural technology

Hopp, R. J. Phenology: An Aid To Agricultural Technology. Vermont Agricultural Experiment Station Bulletin. Vol. 684. Vermont Agricultural Experiment Station Bulletin. Burlington: University of Vermont, 1978.

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