ScienceJohn Michels (Journalist) 1959 |
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Стр. 258
... natural areas , " must be at least 20 acres in size ; no upper size limit has been set , but for purposes of the program areas of more than 1000 acres would not be needed . A single type of forest growth within each area must cover at ...
... natural areas , " must be at least 20 acres in size ; no upper size limit has been set , but for purposes of the program areas of more than 1000 acres would not be needed . A single type of forest growth within each area must cover at ...
Стр. 268
... natural conditions . The first two samples are considered representative of the first two meters ; the 3- and 5 - m samples , of the next 2 - m intervals , respectively ; the 8 - m sample , of the last three meters in the water column ...
... natural conditions . The first two samples are considered representative of the first two meters ; the 3- and 5 - m samples , of the next 2 - m intervals , respectively ; the 8 - m sample , of the last three meters in the water column ...
Стр. 1449
... natural selection is still gen- erally unknown , except for what Darwin called " my abstract ” —On the Origin of Species - published just 100 years ago this November . The long manuscript on " Natural Selection " was already twice the ...
... natural selection is still gen- erally unknown , except for what Darwin called " my abstract ” —On the Origin of Species - published just 100 years ago this November . The long manuscript on " Natural Selection " was already twice the ...
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