1. Ordovician Geology of Lake Winnipeg and Adjacent Areas, Manitoba;Baillie;Manitoba Dep. of Mines and Natural Resources, Mines Branch Publ., 51-6,1952
2. Botryococcus and the algal coals. Part I. A reinvestigation of the alga Botryococcus braunii Kützing;Blackburn;Trans. R. Soc. Edinb.,1936
3. Sur la classification et la distribution des végétaux fossiles en général, et sur ceux des terrains de sédiment supérieur en particulier;Brongniart;Mus. Hist. Nat. Paris, Mém.,1822
4. Report on the Geology of the West Shore and Islands of Lake Winnipeg;Dowling;Geol. Surv. Can., Annu. Rep., N.S.,1900
5. Lethaea ou Paléontologie de la Russie;Eichwald,1860