The National Geographic Magazine, Volume 100National Geographic Society, 1951 - Geography Indexes kept up to date with supplements. |
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Page 518
... winter attire . Some species , like the blue - winged teal ( page 523 ) , which frequently winters as far south as Colombia and Venezuela , delay getting their breeding plumage until January or February , and the ruddy duck waits until ...
... winter attire . Some species , like the blue - winged teal ( page 523 ) , which frequently winters as far south as Colombia and Venezuela , delay getting their breeding plumage until January or February , and the ruddy duck waits until ...
Page 551
... Winter Complicates Heating Problems It may seem strange to the layman , but a much more serious problem than line breaks is that of supplying all customers with enough gas on a very cold winter day . The greater part of the tremendous ...
... Winter Complicates Heating Problems It may seem strange to the layman , but a much more serious problem than line breaks is that of supplying all customers with enough gas on a very cold winter day . The greater part of the tremendous ...
Page 552
... winter and drops to 48,000,000 cubic feet in summer . The weather is an uncontrollable factor , and anyone who assumes that normal weather will be the rule is likely to be disappointed . In January , 1948 , the temperature aver- aged 23 ...
... winter and drops to 48,000,000 cubic feet in summer . The weather is an uncontrollable factor , and anyone who assumes that normal weather will be the rule is likely to be disappointed . In January , 1948 , the temperature aver- aged 23 ...
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