Here are entered works on African Americans who were legally free prior to the Civil War. Works on African Americans who were freed from slavery as a result of the Civil War are entered under Freed persons--United States.
Here are entered works on Black people who were legally free during the period roughly from 1619-1860 and who lived in countries where slavery existed as an institution.
Here are entered works on free diving with the use of mask, fins, and snorkel. Works on free diving with the use of a self-contained underwater breathing apparatus are entered under Scuba diving.
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Free Electron Theory Of Metals -- See Also the narrower term Electron transport
Here are entered works on the physiological and psychological effects of environments in which the gravitational forces are zero or markedly lower than the gravity on earth.Works on the physiological effects of normal gravity and of acceleration expressed in g's are entered under Gravity--Physiological effect.Works on the physics or theory of gravitational forces are entered under Gravitation or Gravity.
