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These kinds of books have grown into a major market, accounting for 25 percent of all publications sold in the U.S.
Which is closer to the original above?
(1) These kinds of books have grown into a major market, and (they have) accounted for 25 percent of all publications sold in the U.S.
(2)These kinds of books have grown into a major market, and (they) account for 25 percent of all publications sold in the U.S.
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Comments  
The result of the process is important here, thus 2
That result could be something that is valid at this time so far, so #1 might be possible, might it not be?
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TakaWhich is closer to the original above?
(2). It's not that they (have) accounted for 25 percent of all publications sold in the U.S. (in the past). It's that, as things stand now, they account for 25 percent of those publications. Had the account been made earlier, probably less than 25 percent of the publications would have been involved.

CJ
 OK.
Jim, would you come up with some cases where 'S have -ed, -ing' is almost the same as 'S have -ed and (have) -ed'? I'd like to compare the difference. 
Sorry, Taka, I don't really understand the question. Can you suggest one as an example? Maybe if you tried one first, I'd get the idea better.
In any case, it sounds like a daunting task, and I'm not sure I'm up to it! Emotion: smile
CJ
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Sorry, it was not clear.
These kinds of books have grown into a major market, accounting for 25 percent...
Subject(S):these kinds of books
have -ed: have grown into a major market
,-ing: ,accounting for 25 percent...
Here  'S have -ed, -ing' is not 'S have -ed, and have -ed': it is not 'These kinds of books have grown into a major market, and have accounted for 25 percent...'
I've been wondering if there is some cases where 'S have -ed, -ing' IS 'S have -ed, and have -ed.'
Would you come up with any, Jim?
Change the participial phrase instead : These kinds of books have grown into a major market, having accounted for accounting for 25 percent of all publications sold in the U.S.
I've found this example:
These cartoon characters have caught the eyes of scholars, bringing out a wave of best-selling studies by academics and scientists who say the comics are more than just escapist entertainment.
Isn't this the same as:
These cartoon characters have caught the eyes of scholars, and they have brought out a wave of best-selling studies by academics and scientists who say the comics are more than just escapist entertainment.
?
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