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SYMPOSIUM PHOTO INTERPRETATION, DELFT 1962
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WAVE LENGTH (MILLIMICRONS)
Fig. 1. Selected curves of light reflectance from tree foliage at Urbana, Illinois, U.S.A., for
four dates during the 1961 growing season.
Fig. 2. Cumulative radial growth during
the 1961 growing season for plantations
of four species at Urbana, Illinois, U.S.A.