Table E-4. Density distributions based on estimated age for selected unionid species from Case-IH 

 (RM 488.5) in Reach 15 of the Upper Mississippi River, 1987. Unionids were collected 

 from 8 quantitative samples covering a surface area of 8 m-. 



Page E- 11 



Whitney et al., Unionid Sur\'ey - Reach 15 UMR 



