Waikato Region:

Waikato Regional Council have an interactive map with a list of all the kahikatea remnants you can visit:
http://www.waikatoregion.govt.nz/Environment/Natural-resources/Biodiversity/Forest-fragments/Kahikatea-forest-fragments/Some-kahikatea-fragments-you-can-visit/#Bookmark_Matamata
Yarndley's Bush:
http://www.waipadc.govt.nz/NR/rdonlyres/76E5A974-71A0-4A73-A653-DCAC186A8526/74818/YarndleysBushFINAL.pdf
more on the history of Yarndley's Bush:
http://www.kiwanis.org.nz/taweyard.htm
Barrett Bush:
https://tui2000.blogspot.com/search?q=Barrett+Bush
Barrett Bush Management Plan
https://www.waikato.ac.nz/__data/assets/pdf_file/0004/165532/ERI-Report-No-2-Barrett-Bush-Management-Plan.pdf
http://www.waikatoregion.govt.nz/Environment/Natural-resources/Biodiversity/Forest-fragments/Kahikatea-forest-fragments/Some-kahikatea-fragments-you-can-visit/#Bookmark_Matamata
Yarndley's Bush:
http://www.waipadc.govt.nz/NR/rdonlyres/76E5A974-71A0-4A73-A653-DCAC186A8526/74818/YarndleysBushFINAL.pdf
more on the history of Yarndley's Bush:
http://www.kiwanis.org.nz/taweyard.htm
Barrett Bush:
https://tui2000.blogspot.com/search?q=Barrett+Bush
Barrett Bush Management Plan
https://www.waikato.ac.nz/__data/assets/pdf_file/0004/165532/ERI-Report-No-2-Barrett-Bush-Management-Plan.pdf