The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 147
... methods their specificity is also a source of weakness . Usually several species of pests attack a given host plant . If biological methods can deal satisfactorily with perhaps three out of five pest species , two pests will still be ...
... methods their specificity is also a source of weakness . Usually several species of pests attack a given host plant . If biological methods can deal satisfactorily with perhaps three out of five pest species , two pests will still be ...
Page 177
... methods led to an economically optimum recovery from each reservoir . These methods often were based on the injection of some less expensive fluid , such as water , to force additional petroleum into the producing wells . As the value ...
... methods led to an economically optimum recovery from each reservoir . These methods often were based on the injection of some less expensive fluid , such as water , to force additional petroleum into the producing wells . As the value ...
Page 1075
... methods . The methods can be and often are combined . RELIEF PROCESSES In relief processes , the negative , or nonprinting part of the block or plate , is either cut or etched away , leaving the design standing in relief . Or , instead ...
... methods . The methods can be and often are combined . RELIEF PROCESSES In relief processes , the negative , or nonprinting part of the block or plate , is either cut or etched away , leaving the design standing in relief . Or , instead ...
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activity America animals appear areas atoms became become body called camera century changes characteristics chemical Church colour common complete compounds consists containing continued drugs early effect electrons elements energy example existence experience Family field Figure fins fishes groups human important increase individual industry Italy known later lens less light liquid living lower major material means ment methods move movement natural North object occur organic original Peking Pentecostal percent period permafrost personality pest Peter petroleum Philip philosophy photographs plants political position possible practice present printing problems production Quakers range region result rocks similar social South species structure surface temperature theory tion United usually widely