YFlood Tide & Cyclops by Clive Cussler

Wings Books, 2001
Omnibus Edition
First Printing "Thus", First Print Number Line: 8 7 6 5 4 3 2 (unusual, but the way that Wings Books listed)
From the dust jacket: "Flood Tide: Dirk Pitt is the Special Projects Director of the National Underwater and Marine Agency (NUMA), and in this action-packed story, his adversary is Qin Shang, a Chinese shipping tycoon intent on bringing the United States to its knees by diverting the Mississippi River. Add a lave ring of illegal immigrants that Shang keeps on a secluded gulag in the Pacific Northwest, and a passenger ship - with a fortune in artifacts - mysteriously sunk when the Communists took over China in 1949, and Pitt, with his ever-present partner, Al Giordino, are just about drowning in danger, suspense, excitement, and adventure!
Cyclops: Raymond LeBaron, a noted financier, sets off in an antique blimp in search of the Cyclops, a U.S. Navy collier which vanished mysteriously in 1918 near Cuba and which may have had a fabulous treasure on board. That's when the excitement begins. When he and his crew also vanish, Dirk Pitt is called in, and discovers a shocking scheme that includes a secret colony on the moon, and a Soviet plot against Castro that threatens world peace. From a Cuban torture chamber to the cold ocean depths, Pitt races against time to defuse an international conspiracy more evil than any he has ever been up against before."

Flood Tide & Cyclops, an omnibus edition combines two Dirk Pitt Adventures by the master of adventure, Clive Cussler.

There has been one other Clive Cussler omnibus book and that was "Iceberg & The Mediterranean Caper."