There is a volunteer for Falls County at www.gengathering.com
. You do have to create a user ID and password to enter this web site but access to the volunteer info IS free. He/she has volunteered for cemetery work but if you can find the directory, maybe they will photocopy the pages. They might know where to find the directory too.
I'd contact the following organizations:
Falls County Historical Museum, 145 heritage Row, Marlin, 76661, 254-883-9101, www.yellowpagesgoesgreen.org/Marlin-TX/
Marlin Public Library, 400 Oaks St., Marlin 76661, 254-883-6602
Central Texas Genealogical Society, www.ctgs.org