"But most of these images were used to do some serious geological work. And many of these images were actually published in this monograph, describing the rocks of the Canadian Rockies. In fact, if you open this volume, in many places you are going to have large panoramas of many landscapes. So once again he used these images to do his work, there’s usually a description at the bottom of these images about what he sees on these images, and it’s a way to quickly take information in the field knowing that in the Canadian Rockies, the weather can change very quickly, and it’s very hard to stay in one place and probably draw all these mountains without being rained on. So usually photography still today is the best way to study the rocks."
Royal Ontario Museum