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. 1930 Apr;5(2):215–223. doi: 10.1104/pp.5.2.215
PRELIMINARY RESULTS IN MEASURING THE HARDINESS OF PLANTS 1
1The University of Wisconsin, Madison, Wisconsin.
1
Contribution from the departments of Agricultural Chemistry and Agronomy of the Wisconsin Agricultural Experiment Station, Madison, Wisconsin. Published with the approval of the Director.
PMCID: PMC440210 PMID: 16652650