Epilithic diatoms and algal productivity of Mill Creek : a study of the effects of acid mine drainage, 190 - 01 - 04 - LD1017 .C8133 1999 S4, Volume: Archives LD1017 .C8133 1999 S4; Volume: Carlson Library Level A Main Quarto Collection QH541.5.M5 S4 1999. Clarion University Archives. http://buoy1.klnpa.org/repositories/2/resources/448 Accessed April 30, 2025.