Usual planting and harvesting dates for US field crops. NASS, U. Agricultural Handbook, 1997.
bibtex   
@article{nass_usual_1997,
	title = {Usual planting and harvesting dates for {US} field crops},
	volume = {628},
	journal = {Agricultural Handbook},
	author = {NASS, USDA},
	year = {1997}
}

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