The National Geographic Magazine, Volume 87National Geographic Society, 1945 - Geography Indexes kept up to date with supplements. |
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Page 721
... birds and then to analyze the visible sound- track record and compute the exact changes in pitch of a bird's song . Indeed , the late Albert R. Brand , who started the bird - song recording project at Cornell , did exactly this for more ...
... birds and then to analyze the visible sound- track record and compute the exact changes in pitch of a bird's song . Indeed , the late Albert R. Brand , who started the bird - song recording project at Cornell , did exactly this for more ...
Page 726
... birds Van Dersal lists pass through my grounds every fall and spring , it stands inviolate . Similarly the high - bush cranberry , relished by birds in New England , where it is native , is recommended by landscape gardeners else- where ...
... birds Van Dersal lists pass through my grounds every fall and spring , it stands inviolate . Similarly the high - bush cranberry , relished by birds in New England , where it is native , is recommended by landscape gardeners else- where ...
Page 727
... birds started preening when they were six days old , they did not scratch until they were seven and did not start bathing until they were thirteen . These were all activities in which the young bird would engage for the rest of its life ...
... birds started preening when they were six days old , they did not scratch until they were seven and did not start bathing until they were thirteen . These were all activities in which the young bird would engage for the rest of its life ...
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