The Abundance of the Collared Lemming (Dicrostonyx Groenlandicus (TR). VAR. Richardsoni Mer.) in the Churchill Area, 1929 to 1940 Shelford, V. E. Abstract Publication: Ecology Pub Date: September 1943 DOI: 10.2307/1930558 Bibcode: 1943Ecol...24..472S