Sign for Argon next to tracks. "About 1/2 mile N. of Mills Tower - IA Falls, IA. View looks N. Ron Sims photo, 2717 Cornell, D.M. IA 50313"--Photograph verso.
Sign "Begin Argon Block/End Iowa Falls Block" near tracks in field. Highway bridge over tracks. "Located about 2 mi. N. of Mills Tower, IA Falls, IA. View looks N. (Hwy 20 bridge in background.) Sims photo, Cornell, IA 50313"--Photograph verso.