The University at Fort Collins Colorado Food Science and Human Nutrition department has experimented with high altitude baking for over 50 years.
"High Altitude Baking"
"Simply Colorado Too"
"Gluten-Free High Altitude Cookbook"
Of course, using High Altitude Flour leaves never a guess about what to add and what to leave out! Try it! You may find the High Altitude flour at City Markets and Walmart.
No need for a cat's tomatoe souflee to fail just because they live in Grand Junction, CO.