Botanical studies in the Yukon and Northwest Territories carried out in 1972 in connection with Geological Survey of Canada field parties run by Dr. O. Hughes and Dr. N. Rutter
Preface -- About mosses and liverworts -- Classification -- How to study bryophytes -- General references -- How to use the keys -- Pictured-key to the bryophytes of North America -- Musci, the mosses -- Class I. anthrocerotae, the hornworts -- Class II. Hepaticae, the liverworts -- List of synonyms -- Index and pictured-glossary.