784 BRADT 



Usinger, R. L., 1956, Aquatic Insects of California, University of California 

 Press, Berkeley. 



Wilhm, J. L., and T. C. Dorris, 1966, Species Diversity of Benthic Macro- 

 invertebrates in a Stream Receiving Domestic and Oil Refinery Ef- 

 fluents, Am. Midi. Nat., 76(2): 427-449. 



, 1968, Biological Parameters for Water Quality Criteria, BioScience, 18: 



477-481. 



Young, R., et al., 1972, Environmental Baseline Study of the Bushkill Creek, 

 National Science Foundation Sponsored Undergraduate Research Project, 

 Lafayette College, Easton, Pa., unpublished report. 



