11.   Some art historians have suggested that it represents a gateway to both modern Argentine and Mexican painting.

12.   Some sources say they originated in the Moscow region, but other historians suggest that the Stroganoffs descended from the semibarbaric Asiatic tribes of eastern Russia.

13.   Some historians have suggested that Cleopatra may have tried to seduce Octavian after he defeated her and Antony, and that she committed suicide only after her gambit failed.

14.   Some medical historians have suggested that he picked up a tropical disease during his epic voyage aboard the Beagle.

15.   These operations, some historians suggest, were often used as a means of social control.

16.   Historians have suggested the Hunley took on water after the explosion either shot out or blew out a viewport in the front conning tower.

17.   Historians suggested that literature based on historical facts should be distributed in small towns and villages through similar workshops.

18.   Historians suggest that most of the original Indian population was wiped out in such plagues.

19.   Some historians have suggested that President Franklin Roosevelt deliberately allowed the attack to go forward as a way of taking the United States into the war.

20.   Some historians suggest that the White House is using heightened public interest in national security as a screen for clamping down on the release of presidential papers.