Mary Yearl, a librarian at McGill University, created this impressively comprehensive research guide about the history of medicine. While some of the included resources require a university subscription to access, this guide also includes numerous items that are freely available to researchers around the world. In particular, the digital collections section features dozens of websites where visitors will find digitized archival material from around the world, including Canada, the United States, Latin America, and Europe. Additional materials of interest can be found in the image collections list, which features digitized medical illustrations, patient cards, photographs, and more from universities and libraries around the world. This guide also features a section called Osleriana dedicated to materials relating to Sir William Osler, a Canadian physician and McGill University alumnus who was one of the co-founders of John Hopkins Hospital.