Following is a membership application with the different levels of membership that are available if you are interested in supporting the mission of the South Platte Valley Historical Society. Membership in the Tallow River Trappers is in addition to membership in the South Platte Valley Historical Society. See the mail-in application form below. The left column is for SPVHS only membership and the right column is for SPVHS and TRT membership. Download the application form file, print it out and mail it to the address on the form.