Preservation of Classical Engineering Books

[GMianG]

Some excellent classical engineering books like the "Civil Engineer's Hand Book" by Khanna and by Sir Ganga Ram need preservation in e-book form. What may be the way. These books are very precious and still best guides on certain problems.

[ynopum]

Just scan it.
If the book is black&white you can use 600dpi scan and resolution black&white raster format.
Then you can make it either PDF or DjVU format.