00422nam a22001217a 4500020000900000082001500009100002100024245002600045260004500071300003600116500006200152650008600214  a(hb)  a301.3bHAL  aHall, Edward T.   aThe Hidden Dimension   aNew yorkbDoubleday & Company, Incc1914  axii, 201p. b: ill. c; 24 cm .  aIncludes appendix, bibliographical 
references and index.  aSpace perceptionvSpacing mechanismsvAnimal behaviourvPopulation control vRIPS