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1992
Roberts, W. E. (1992).  Declines in amphibian populations in Alberta. Occasional Papers No. 76, 14-16.
1991
Roberts, W. E. (1991).  An action plan for the recovery of the northern leopard frog in Alberta. Natural History Occasional Papers No. 15, 199-200.
Roberts, W. E. (1991).  The bull trout vanishing from the prairie and parklands of western Alberta. Natural History Occasional Papers No. 15,
1990
Roberts, W. E. (1990).  The prickly sculpin (Cottus asper) recorded from Alberta (with a key to sculpins found in Alberta). 20, 24-26.
1989
Roberts, W. E. (1989).  The mooneye in Alberta. 19(4), 134-140.
1988
Roberts, W. E. (1988).  The sculpins of Alberta. 18(4), 121-127, 153.
1987
Roberts, W. E. (1987).  The bull trout - endangered in Alberta. Natural History Occasional Papers No. 9,
Roberts, W. E. (1987).  The northern leopard frog endangered in Alberta. Natural History Occasional Papers No. 9, 137-138.
1982
Roberts, W. E. (1982).  Threatened or endangered native species of amphibians and reptiles of Alberta. 12(2), 54.
1977
Roberts, W. E. (1977).  The distribution of the wandering garter snake (Thamnophis elegans vagrans), the western plains garter snake (T. radix haydeni) and the red-sided garter snake (T. siralis parietalis) in Alberta. Unpublished manuscript, 10.

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