1932
Gordon, Anita G.
1947
McKay, Donald Gordon.
1961
Swinson, Derek B.
1963
Rumfeldt, R. C.
Johnson, Charlie Ernest.
The Permian genus spiriferella from the Yukon Territory was analyzed by detailed study of internal and external morphology along with stratigraphic occurrence. Five species were recognized.
1964
Ng, Eric Kwong-Sun
1965
Pilkington, G. Roger.
Baird, George A.
Marsh, John Stuart.
Jenkins, Robert W.