The Math 141 calculus course at Colorado State University seems to be the only course that does not list its sample exams on their course page. However ASCSU does have a Test File that includes one version of each of the four exams. You can download those exams and others that I have compiled over the years at the links below.
I have also created study guides for each of the Math 141 Exams.
Math 141 Exam Study Guides