...), forwhich the chief consideration seems to be availability of coniferseeds... 
Richard F. Johnston 「The Breeding Birds of Kansas」
...The availability of suitable habitat brought on by the rainy season and the regular occurrence ofcenoteshelps to explain the presence of such species far outside the Rain Forest zone...
Erwin E. Klaas 「Summer Birds From the Yucatan Peninsula」
...Apparently, the availability ofthese foods is one of the major factors affecting the distribution ofP...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...In Hume's case, therewas no ill-founded conclusion of the availability of thefreshly-discovered district...
Ernest Favenc 「The Explorers of Australia and their Life-work」
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