IsisCB Cumulative, 1913-1975 has now been fully digitized. Duringe 2017, this content will be made searchable in the IsisCB Explore site. Meanwhile volumes can be opened and scanned for keywords. Even before full searchability, using the online versions will be much more convenient than our paper volumes at West Campus:
ISIS cumulative bibliography : a bibliography of the history of science formed from ISIS critical bibliographies 1-90, 1913-65
and ISIS cumulative bibliography, 1966-1975 : a bibliography of the history of science formed from ISIS critical bibliographies 91-100, indexing literature published from 1965 through 1974.
More info: IsisCB Cumulative: Data from 1913 to 1975 is now open access.
The other targeted index, History of Science, Technology, and Medicine, only goes back to 1975.