RT Journal Article SR Electronic T1 The Class-Hour Economy JF Harvard Educational Review JO herp FD Harvard Educational Press SP 161 OP 164 DO 10.17763/haer.35.2.m17qw16542240878 VO 35 IS 2 A1 Schellenberg, James YR 1965 UL http://harvardeducationalreview.org/content/35/2/161.abstract AB A sociologist examines the pressures and assumptions that make ubiquitous the use of time as the unit of academic credit in American higher education.