As advertising spending in magazines continues to decline, publishers are intensifying their search for revenue from marketers.

Newsstand sales of magazines fell 6.3 percent in the first half of 2008, an industry group said Monday, as rising gas and food costs led consumers to cut back on nonessential spending.

Magazine ad sales fell more than 8 percent in the second quarter, with the steepest drops in ads for vehicles and for computers and related equipment.