CONTENTS 



Page 



Introduction 1 



Methods of enumerating marine mammals 2 



Aerial photographic census in Alaska, 1956-58 2 



Equipment and techniques 2 



Categories of animals 4 



Analysis of photographs 5 



Summary of counts 6 



Variations in counts 1 



Diurnal variations 9 



Seasonal variations 10 



Total population estimate 13 



Summary 16 



Acknowledgments 17 



Literature cited 17 



Appendix 18 



111 



