海量图书期刊资源,随时随地畅享阅读乐趣
CONNATE ANTHERS IN GENTIANA (GENTIANACEAE)Wilbur H. Duncan, Wilbur H. Duncun and Claud L. Brown · Rhodora · 1954
Elliottia in the Piedmont of GeorgiaWilbur H. Duncan and Marion B. Duncan · Castanea · 1978
Angelica triquinata (Umbelliferae) Southward and Lotus helleri (Leguminosae) Westward into GeorgiaWilbur H. Duncan and Wilber H. Duncan · Castanea · 1971
Stipular Spines in Celtis (Ulmaceae) of the SoutheastWilbur H. Duncan and Marion B. Duncan · Castanea · 1990
Vittaria lineata from Lincoln County, GeorgiaJoseph H. Pyron and Wilbur H. Duncan · American Fern Journal · 1939
Leaf Variation in Liquidambar styraciflua L.Wilbur H. Duncan · Castanea · 1959
Notes and NewsWilbur H. Duncan · Castanea · 1949
Chinese virtual issuePan, B.; Wang, Q.; Zhao, F. · European Journal of Soil Science · 2012
Cation exchange capacity measurementsHorn, D. P.; Alley, M. M.; Bertsch, P. M. · Communications in Soil Science and Plant Analysis · 1982
Lithium toxicity in plantsWallace, A.; Romney, E. M.; Cha, J. W.; Chaudhry, F. M. · Communications in Soil Science and Plant Analysis · 1977
Soil organic matter determinationGallardo, J.F.; Saavedra, J.; Martin‐Patino, T.; Millan, A. · Communications in Soil Science and Plant Analysis · 1987
AbstractsCommunications in Soil Science and Plant Analysis · 1994
Soil zonality of the Chukotka UplandKaravaeva, N. A. · Eurasian Soil Science · 2013
Maximizing calcium uptake by plantsKirkby, E. A. · Communications in Soil Science and Plant Analysis · 1979
SOIL ERODIBILITY, FALL AND SPRINGAnderson, C. H.; Wenhardt, A. · Canadian Journal of Soil Science · 1966