''There are literally tens of thousands of books here. I think our oldest (book) goes back to the late 1800s and we have a great series of five The Times History books from 1901 that are just fascinating,'' McPherson said.
''Originally they were lent out from Whangārei Library, with the last time they were taken out on October 1, 1921 - it boggles the mind to think where they might have been since then.''
She said there are many categories of books on offer this weekend, including history, biographies, gardening, war, westerns, wellbeing, art, poetry, music.
This is the 26th year of the Zonta Great New Zealand Book Sale and in that time it has raised more than $500,000 for the support and education of women in the community.
As well as giving to local causes, the Whangārei and the Hatea clubs put proceeds into the national Zonta organisation's annual cause.
The doors open on the Great New Zealand Book Sale at Forum North at 7am on Saturday, until 5pm, and again on Sunday, from 8am-2pm.