Frederic Edward Clements, Plant Indicators: the Relation of Plant Communities to Process and Practicel (1920)
“ Concept and HistoryConcept and History The practical aspect 3 The scientific aspect 3 HistoricalHistorical Agricultural IndicatorsAgricultural Indicators Hilgard, 1860 5 Chamberlin, 1877 5 Merriam, 1898 6 Hilgard, 1906 8 Clements, 1910 9 Shantz, 1911 10 Kearney, Briggs, Shantz, McLane, and Piemeisel, 1914 11 Shantz and Piemeisel, 1917 12 Shantz and Aldous, 1917 13 Weaver, 1919 13 Forest IndicatorsForest Indicators Cajander, 1909 14 Clements, 1910 14 Pearson. 1913-1914 15 Zon, 1915 16 Hole and Singh, 1916 16 Korstian, 1917 17 Grazing IndicatorsGrazing Indicators Smith, 1899 19 Bentley. ”
