U. S. NATIONAL MUSEUM 



BULLETIN 183 PLATE 33 



VIEWS AT PEARL BRANCH MOUND GROUP. 



a, South ridge bearing stone chambered mounds, Missouri River in background; b, Nolan 

 mound C from north, with earth and rock mantle removed to show slabs buttressing 

 chamber wall; c, Nolan mound C from north, showing square burial chamber with 

 south entrance, large buttressing slabs, and outer sheath of earth and stones. 



