00343nam a2200121Ia 450000500170000000800410001702000200005808200180007810000250009624500560012126000340017730000100021120260205101246.0260111s9999||||xx |||||||||||||| ||und||  a9780-822-342649  a303.4833  KEL  aKelty Christopher M. 0aTwo bits: the cultural signifiance of free software  aU.S.A.bDuke universityc2008  a378p.