Materials created and accumulated by Linda Mortsch relating to climate change and the environment.

Collection consists of 82 plans of gravel pits in Ontario. The plans have been collected by Wayne Caston, and he was involved in consulting in many of the projects. The records in this finding aid consist of information taken from an Excel spreadsheet created by Caston with details on each of the plans. A printout of the spreadsheet is also present in the collection. Plans are listed in the order originally provided by the donor on the spreadsheet.

William Tutte's manuscript notebook from his time as a student at Trinity College Cambridge. Manuscript includes graphs and formulas regarding the Four colour theorem or the Four colour map theorem (considered the central problem in graph theory). Notebook includes a folder with annotations made by Tutte referring to the content and pages with his annotations divided into twelve sections.