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There 506 cases.  Variable names are given below :

House Value : logrithm of the median value of owner occupied home.
 Crime : crime rate by town.
%Zoned : proportion of residential land zoned for lots greater
               then 25000 squares feet.
%Industry : proportion of nonretail business acres per town.
River :  =1, if tract bounds the Charles River; 0, otherwise.
Nox : nitrogen oxide concentration in pphm.
Rooms : average number of rooms in owner units.
%Old :  proportion of owner units built prior to 1940.
Wdist : wieghted distanced to five emplyment centers in Boston.
Hiway: index of accessibility to radial highways.
Tax : full property tax rate.
Pup/Teach : pupil-teacher ratio by town school district.
Blacks : black proportion of population
%Poor : proportion of population that is in the lower income status.
 
 

Remark :
A special geograghical group with case number from 356 to 487
has very high crime rate and same values on variables 2,3,9,10,11, (%Zone,
%Industry, etc).