1. Waldgrenzen und subrezenten Pollen-Spektren in Petsamo, Lappland;Aario;Ann. Acad. Sci. Fennicae,1940
2. Über die pollenanalytischen Methoden zur Untersuchung von Waldgrenzen;Aario;Geol. Fören. Stockholm Förh.,1944
3. Physiographicdivi sions of Saskatchewan;Acton;Saskatchewan Res. Council, Geol. Div., Map.,1960
4. Botanical investigations in northeastern Saskatchewan: the subarctic Patterson-Hasbala Lakes region;Argus;Can. Field Naturalist,1966
5. Ecology of the Aspen Parkland of western Canada;Bird;Can. Dept. Agr., Publ.,1961