Since you are interested in Ake Ake, Kia Kaha e! - Songs of the New Zealand 28 (Maori) Battalion, here is a list of other items that you may find interesting.
Ngati Poneke Young Maori Club
Ko Ngati Poneke Hoki Matou
[ Atoll Records New Zealand / CD - released 13/Oct/2003 ]
SPECIAL PRICE FOR A LIMITED TIME - These classic concert party recordings of the Ngati Poneke Young Maori Club feature solos by Witarina Harris, founder member. The recordings, dating from the late 1930s.