Kauanoe Kamanā, William H. Wilson
Nā Kai ʻEwalu is an excellent book for learning the Hawaiian language as it explains the rules of the language in the style of Hawaiian language structure and using Hawaiian words. The first year book has been recently revised and enlarged and comes in two sections.
Volume 1: Chapters 1-14 (Year 1)
Volume 2: Chapters 15-27 (Year 2)