Midknight: Interesting. Thanks. Do you know if there is a comparable way to go from PDF to WORD?

My files are large -- 150 pages of text.

This may be a crucial factor: My PDF file will be created by scanning some hundred pages of hard copy. I have scanned one page and find that:
a. The scanned document looks like the hardcopy but I find I cannot highlight individual blocks of text. It may just be a picture of the hardcopy; and
b. Yet the Find function seems to recognize words --- but only words appearing in one of the three columns.

All quite puzzling to me.