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1993
Ritchie, J. C., & Harrison S. P. (1993).  Vegetation, lake levels, and climate in western Canada during the Holocene. Chapter 16, 401-414.
1989
Anderson, P. M., Bartlein P. J., Brubaker L. B., Gajewski K., & Ritchie J. C. (1989).  Modern analogues of Late-Quaternary pollen spectra from the western interior of North America. 16(6), 573-596.
1987
Ritchie, J. C. (1987).  Postglacial vegetation of Canada. 178.
1986
MacDonald, G. M., & Ritchie J. C. (1986).  Modern pollen spectra from the western interior of Canada and the interpretation of Late Quaternary vegetation development. 103, 245-268.
Ritchie, J. C., & MacDonald G. M. (1986).  The patterns of post-glacial spread of white spruce. 13(6), 527-540.
1984
Ritchie, J. C. (1984).  Past and present vegetation of the far northwest of Canada.
1983
Ritchie, J. C. (1983).  The paleoecology of the central and northern parts of the Glacial Lake Agassiz basin. Special Paper No. 26, 157-170.
1978
Ritchie, J. C., & Yarranton G. A. (1978).  Patterns of change in the Late-Quaternary vegetation of the Western Interior of Canada. 56, 2177-2183.
1976
Ritchie, J. C. (1976).  The Late Quaternary vegetational history of the western interior of Canada. 54, 1793-1818.
1972
Hare, K. F., & Ritchie J. C. (1972).  The boreal bioclimates. 62, 333-365.
1969
Lichti-Federovich, S., & Ritchie J. C. (1969).  Recent pollen assemblages from the western interior of Canada. 7, 297-344.
1967
Ritchie, J. C. (1967).  Holocene vegetation of the northwestern precincts of the glacial Lake Agassiz basin. In : W. J. Mayer-Oakes (ed.) Life, land and water. 217-229.
Ritchie, J. C. (1967).  Report on pollen analysis of peat samples from a bog at site SV-86, Iosegan East area, Alberta. Collected by D. A. St-Onge. 10.
1964
Ritchie, J. C., & de Vries B. (1964).  Contributions to the Holocene paleoecology of west-central Canada. 42, 677-692.

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