51.  An official with the union representing the caseworkers did not dispute that self-protection was the driving force behind the increased removal of children.

52.  Among other accomplishments, the senior Roosevelt was the driving force behind the establishment of the American Museum of Natural History in Manhattan.

53.  Analysts said the driving force in the price surge was a major commercial grain company, which they identified as Bunge Corp.

54.  Analysts say that has been the driving force behind reorganizations planned at Prudential Life Insurance Co. of America, John Hancock Life Insurance Co. and others.

55.  And it now regularly prints advertising circulars in newspapers, a driving force in increasing discount store sales, instead of relying almost exclusively on television.

56.  And he has been a driving force behidn the BCS series to determine the national football titleist.

57.  And that was the driving force for me.

58.  And patriotism is not always the driving force behind military enlistment.

59.  And similar grass-roots pressures could, some think, be a driving force of future convulsions in Chinese politics or economics.

60.  And through the Lowell Institute, he was the driving force behind the creation of WGBH-TV.