First, learn to speak English. Your post is one run on paragraph and is almost
unintelligible. One idea per paragraph.

> Hello, I wish to download plain ASCII text files
> from the following nonlogin webpage(s)
> <http://www.wdol.gov/wdol/scafiles/archive/davisbacon>
> /
That URL can not be read.

> There are 8 subfolders after `davisbacon', one for
> each of the following years;
> 2000,2001,2002,2003,2007,2008,2009,2010. I have not
Either you must spider the site to get the URLs or list them or guess: Number
sequences: How to mirror only files/URLs using a certain ID/number range -
<http://httrack.kauler.com/help/URL_number_sequences>

> abbreviation in capitals, for example (CA)+(1)-click
> on search pressing Enter does nothing--result is
HTT does not click on forms. If the URLs don't exist on the site except
through the form, can't be done.

If you only want the text files, spider the site and get only the html
(text/html) and the text (text/plain): -* +mime:text/*