Petersen Cos., New York, said it acquired Watersport Publishing, San Diego. It said it will add Watersport's two publications--Discover Diving
, an every-other-monthly consumer title, and trade magazine Dive Report
, also an every-other-monthly-- to its Skin Diver Marine Group. Included in the purchase is Watersport's Discover Diving Expositions
. Watersport Publishing founder Ken Loyst will join Petersen
Copyright September 1998, Crain Communications Inc.