What is the fine-grained topic of the following text: Despite his profession as an English teacher at the Fountain Valley School and later as an English Professor at Colorado College, Ormes is most widely known for his contributions to Colorado Mountaineering via the publication of A Guide to the Colorado Mountains, which was the earliest and most complete guidebook to the Colorado Rockies first published in 1959. Only return the topic.
Ormes' contribution to Colorado Mountaineering through his publication "A Guide to the Colorado Mountains"