The National Speleological Society website includes several contacts for the Timberline Grotto, including e-mail, telephone and mail addresses. Here is a direct link: http://www.caves.org/io/iolookup.php?ionum=000323.
For any registered grotto, the Society includes full contact information as submitted with the annual report.
Richard Rhinehart Editor, Rocky Mountain Caving www.RockyMountainCaving.com