There seems to be little geographic variation in maximum size.

When you include other sources of natural radiation, the geographic variations are quite large.

There is considerable geographic variation in the natural history of this species.

One explanation for the different versions of reality might be geographic variation.

There is much geographic variation in size, proportions, color, and skull features.

He also wrote a book about the social behavior and geographic variation among Andean birds, published in 1979.

The differences are one example of perplexing geographic variations in medical expenses and quality.

The audit rate, affected by many factors, has considerable geographic variation.

The city has little geographic variations within its boundaries.

Currently, 28 subspecies based on these geographic variations are recognized.