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Atlantic City, N.J. • Like a ship struggling to right itself in a roiling sea, Atlantic City's casinos are trying mightily to find balance amid a rapidly contracting and constantly changing gambling market.

On Monday, they got some unexpected good news, even if it might not last long.

Not counting the Atlantic Club, which closed in January, the 11 casinos that operated in both 2014 and 2013 increased their revenue by nearly 4 percent in June. Most of that improvement was due to the $9.5 million in Internet gambling winnings that did not exist a year ago.

The numbers come as Atlantic City's casino market is experiencing a rapid contraction. Trump Plaza sent out closing notices to 1,153 workers Monday, the Showboat is closing Aug. 31, and Revel says it also will shut down if a buyer can't be found at a bankruptcy court auction next month. That could result in a quarter of Atlantic City's casinos shutting down in just nine months in the oversaturated northeastern gambling market.

With the Internet money and without the Atlantic Club, the casinos won $235.9 million in June, up from $227.1 million in June 2013, when Internet gambling was not yet legal in New Jersey. Although it still helped the bottom line, Internet gambling registered its third straight monthly decline.

When the Atlantic Club's revenue numbers are factored in, however, the casinos' revenue was down 5.7 percent for the month.

Trump Plaza posted the biggest decline in June, down nearly 32 percent from a year ago to $4.7 million. Showboat was down 16.6 percent to $14.1 million, and Revel was down 1.9 percent to $11.3 million.

The Golden Nugget posted the biggest monthly increase, up more than 34 percent to $14.3 million. The Tropicana was up nearly 23 percent to $25.8 million.

Among Internet gambling sites, the Borgata continued to lead the market with $3.4 million in online winnings. Caesars Interactive had $2.6 million, the Tropicana had $1.7 million, the Golden Nugget had $710,635 and the two Trump casinos each had about a half million in online revenue in June.