1 Subjects: “...Specific gravity...”

2

3 Subjects: “...dark matter, gravity, dark energy, simulation, politics, generation model...”

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6 Subjects: “...gravity trade model...”

7 Subjects: “...gravity...”

8 Subjects: “...structural gravity model...”

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11 Table of Contents: “... for emission -- Illustration of a penalty calculation with a gravity component -- Terminology -- Executive...”

12 “... of gravity of the world is shifting. Whether the world can manage a soft landing into sustainable equilibrium...”

13 “... century onward in which the center of gravity of African migration moved decisively inward. Most books...”