I think there is a program that allows you to save a series of images into a book. I cannot remember the name of the program or the formats it uses to save books.

If the book is rather long, say a couple hundred pages or more in length, then you might have to break the book into multiple eBooks. Images cause an eBook file to be large, and hundreds of images can make for a huge eBook file which makes for slow loading times and sluggish behavior even on a fast desktop computer.

I'm sure there are easier programs to use, but if all else fails you can use MS Word to create a book from all the images and then save it to a PDF. This will be a painfully slow and tedious process, so see what else is available. But if you do create your owns PDF from MS Word or another program, be sure to use small margins to get rid of excess white space and use a page size appropriate for the iPad. A typical PDF is saved as a 8.5 x 11 inch page. That is too big for the iPad and most other reading devices. Decrease the page size so that it fits your screen without decreasing the font sizes.