Callow, J.M.; Kantrud, H.A.; Higgins, K.H. 1992. First flowering dates and flowering periods of prairie plants at Woodworth, North Dakota. Prairie Naturalist. 24(2): 57-64.

Callow, J.M.; Kantrud, H.A.; Higgins, K.H. 1992. First flowering dates and flowering periods of prairie plants at Woodworth, North Dakota. Prairie Naturalist. 24(2): 57-64.

Callow, J.M.; Kantrud, H.A.; Higgins, K.H. 1992. First flowering dates and flowering periods of prairie plants at Woodworth, North Dakota. Prairie Naturalist. 24(2): 57-64.

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