His Comparative Eskimo Dictionary, co-authored with Steven Jacobson and Lawrence Kaplan, is the standard work in its area, as is his Comparative Chukotko-Kamchatkan Dictionary.
Hans verk Comparative Eskimo Dictionary, med Steven Jacobson och Lawrence Kaplan som medförfattare, är standardverket inom sitt område, liksom hans verk Comparative Chukotko-Kamchatkan Dictionary.