The fourth and fifth series are covered in 'The White Ships'.
Series six to eight were not novelised.
It's worth mentioning that in the books events do not unfold in quite the same way as they do on screen and some are omitted. There are also some characters who do not appear in the novels. I wrote a little piece detailing some of these variations for the Wikipedia article on The Onedin Line if anyone is interested in having a look.
— In firstname.lastname@example.org, Marianne GS <marianne@…> wrote:
> For the first 2 series there are 3 books:
> The Shipmaster
> The Iron Ships
> and The High Seas
> You can all order them on amazon or sometimes on eBay.
> Kind regards,