Birds of BC : Campbell et al:

 

Reference to this book ( volume 1) is included here as it includes references to Leach’s Storm Petrels as well as other seabirds from Cleland Island research. (See it in a library or purchase. )

It is summarized at http://books.google.ca/books?id=SjHElegFfOUC&source=gbs_navlinks_s