“Ask Dartmouth” says that the proportion of Macs at Dartmouth is 44 percent (having dropped from nearly 100 percent 15 years ago, at least among undergraduates?). The Dartmouthbiz blog has several posts on the history of computing at Dartmouth, covering Dartmouth’s selection of the Mac (more). Further back are GE and Dartmouth and the SysProg Reunion.

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[Update 11.13.2012: Four broken links to dartmouthbiz.com removed.]