Zaidi Hadith books

Books written by Zaidi Imams and scholars are in multiple situations:

1) Works that are printed and preserved.

2) Works which are preserved but have not been printed, they are only hand written. These might be books that exist multiple copies and some are with people who take care of them (for example scholars, collectors, or publishing stores)

3) Works that are hand written and think still exist but are not in reliable hands or we are not sure where they exist.

4) Books that have been lost.

In all these categories I do not have exact numbers.

And Allah knows best