R. G. D. Allen was born in 1906.
R. G. D. Allen died in 1983.
K. G. R. Allen has written: 'Evaluation of four ultrasonic therapy units'
John R. Allen was born in 1953.
Allen R. Bushnell was born in 1833.
G. R. Allen has written: 'The impact of food aid on donor and other food-exporting countries'
Roderick R. Allen was born on 1894-01-29.
Allen R. Morris was born on 1954-04-23.
James R. Allen was born on 1925-11-17.
Allen R Miller was born on 1942-12-02.
Phillip R. Allen was born on 1932-03-26.
Ray R. Allen was born on 1920-07-05.
value of acceleration due to gravity is maximum at the surface of earth. So the gravitational field strength. as g'=g(1-d/R) at surface d=R so d=R so g'=g at earth's centre g=0. Its value decrease with decrease or increase in height. as: g'=g(1-2h/R) ......for height h and g'=g(1-d/R) .....for depth d