Unable to view my previously purchased Books on iPad.

Hi Kalamma,

welcome to the Apple (user-to-user) Coimmunity.

Re: My previously purchased books are not available on my iPad. Looks like they have disappeared

You might want to check if your iPad has enough free storage space for everything you want to keep on it.

How to check the storage on your iPhone and iPad - Apple Support

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If space is needed: First Back-up your iPad: How to: Back up iPad - Apple Support

Then see "Manage space on your iPad in the article below for tips:

If you need more space for an update on your iPhone, iPad or iPod touch - Apple Support

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If (or when) storage space is not-a-problem:

See how to: Redownload books and audiobooks - Apple Support

and

"Learn what to do if you can't redownload an item or if you don't see the item in your purchases."

If there's an issue when you redownload apps, movies, or other content from Apple - Apple Support

All the best :-)