To examine the evolving role of the Master of Library Science (MLS) degree in academic libraries, pooled cross-sectional data were collected from job advertisements in "College and Research Library News." Beginning with 1975 and continuing at 5-year intervals through 2005, pertinent information from all job advertisements in each monthly issue were compiled. The data produced many interesting facts, such as job openings requiring an MLS peaked in the early 1990s, and that there is a significant drop in a prerequisite MLS beginning in the year 2000. (Contains 7 tables and 1 figure.)