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1993
Clifford, H. F., Wiley G. M., & Casey R. J. (1993).  Macroinvertebrates of a beaver-altered boreal stream of Alberta, Canada, with special reference to the fauna on the dams. 71, 1439-1447.
1992
Clifford, H. F., Casey R. J., & Saffran K. A. (1992).  Short-term colonization of rough and smooth tiles by Benthic macroinvertebrates and algae (chlorophyll a) in two streams. 11(3), 304-315.
1989
Clifford, H. F., Gotceitas V., & Casey, Richard J. (1989).  Roughness and color of artificial substratum particles as possible factors in colonization of stream invertebrates . 175(2), 89-95.
1982
Clifford, H. F. (1982).  Effects of periodically disturbing a small area of substratum in a brown-water stream of Alberta, Canada. 1(2), 39-47.
Clifford, H. F. (1982).  Life cycles of mayflies (Ephemeroptera), with special reference to voltinism. 18, 15-90.
1981
Baker, R. L., & Clifford H. F. (1981).  Life cycles and food of Coenagrion resolution (Coenagrionidae : odonata) and Lestes disjunctus (Lestidae: Odonata) populations from the boreal forest of Alberta, Canada. 3(3), 179-191.
1980
Corkum, L. D., & Clifford H. F. (1980).  The importance of species associations and substrate types to behavioural drift. 331-341.
1979
Clifford, H. F., Hamilton H., & Killins B. A. (1979).  Biology of the mayfly Leptophlebia cupida (Say) (Ephemeroptera:Leptophlebiidae). 57, 1026-1045.
1978
Clifford, H. F. (1978).  Descriptive phenology and seasonality of a Canadian brown-water stream. 58(3), 213-231.
1974
Lei, C. -hsiang, & Clifford H. F. (1974).  Field and laboratory studies of Daphnia schodleri Sars from a winterkill lake of Alberta. Publications in zoology No. 9, 53.
1973
Clifford, H. F., Robertson M. R., & Zelt K. A. (1973).  Life cycle patterns of mayflies (Ephemeroptera) from some streams of Alberta, Canada.
1972
Clifford, H. F. (1972).  Comparison of stream bottom fauna samples collected during the day and night. 17, 479-481.
Clifford, H. F. (1972).  A year's study of the drifting organisms in a brown-water stream of Alberta. 50(7), 975-983.
1970
Clifford, H. F. (1970).  Analysis of a northern mayfly (Ephemeroptera) population, with special reference to allometry of size. 48, 305-316.
Clifford, H. F. (1970).  Variability of linear measurements throughout the life cycle of the mayfly Leptophlebia cupida (Say) (Ephemeroptera: Leptophlebiidae). 46(2), 98-106.
1969
Clifford, H. F. (1969).  Limnological features of a northern brown-water stream, with special reference to the life histories of the aquatic insects. 82(2), 578-597.

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