Science, Том 72John Michels (Journalist) American Association for the Advancement of Science, 1883 Since Jan. 1901 the official proceedings and most of the papers of the American Association for the Advancement of Science have been included in Science. |
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Стр. 85
... Douglas Fir Forest . Dr. E. J. Lund will demonstrate elec- trical polarity in the Douglas Fir . August 21 - Thursday 8:30 A. M. 8:30 A. M. 8:30 A. M. Visit in row boats to Nereocystis beds . Marine dredging and marine ecology . Trip to ...
... Douglas Fir Forest . Dr. E. J. Lund will demonstrate elec- trical polarity in the Douglas Fir . August 21 - Thursday 8:30 A. M. 8:30 A. M. 8:30 A. M. Visit in row boats to Nereocystis beds . Marine dredging and marine ecology . Trip to ...
Стр. 256
... Douglas fir region of Oregon and Washington was considered . The displacement of Douglas fir by hemlock and cedar , its reappearance in burned and logged land , and the rôle of drought , seed supply , temperature and animal enemies in ...
... Douglas fir region of Oregon and Washington was considered . The displacement of Douglas fir by hemlock and cedar , its reappearance in burned and logged land , and the rôle of drought , seed supply , temperature and animal enemies in ...
Стр. 330
... Douglas fir seed remains viable in the forest floor more than one year . Hence we are forced to the conclusion that unless there has been a good seed fall within a year prior to the cutting , little Douglas fir reproduction can be ...
... Douglas fir seed remains viable in the forest floor more than one year . Hence we are forced to the conclusion that unless there has been a good seed fall within a year prior to the cutting , little Douglas fir reproduction can be ...
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B Mosquito Vectors of Experimental Yellow | 1 |
Polar Exploration I BowMAN 439 | 13 |
Sudan III Behavior of E H MACARTHUR | 14 |
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