TY - RPRT TI - Occurrence of invertebrates at 38 stream sites in the Mississippi Embayment study unit, 1996-99 AU - Brian J. Caskey AU - B. G. Justus AU - Humbert Zappia PY - 2002 DO - 10.3133/ofr02190 UR - https://pubs.usgs.gov/publication/ofr02190 ID - ofr02190 ER -