Silicified silurian odontopleurid trilobites from the Mackenzie Mountains /

by Chatterton, B. D. E. (Brian D. E.)
Published 1983

Sponges of the Burgess shale (Middle Cambrian), British Columbia /

by Rigby, J. Keith
Published 1986

Ichnology of the Upper Cambrian? to Lower Ordovician Bell Island and Wabana groups of eastern Newfoundland, Canada /

by Fillion, Denis, 1957-
Published 1990

Silurian (Wenlock) demosponges from the Avalanche Lake area of the Mackenzie Mountains, southwestern District of Mackenzie, Northwest Territories, Canada /

by Rigby, J. Keith
Published 1999