James C. Gross,

57, a National Park Service official since 1973 and an area resident since 1950, died Nov. 30 at his home in Washington after a heart attack.

Since 1983, Mr. Gross had been special assistant to the director of the National Park Service's National Capital Region. He spent his first five years with the Park Service as general manager of the National Visitors Center. From 1978 to 1983, he was a liaison officer to the old President's Commission on the Holocaust, now the U.S. Holocaust Memorial Council.

Mr. Gross was a native of Cyclone, Pa., and a graduate of the University of Toronto's Royal Conservatory of Music. He served in the Army from 1950 to 1952.

Before joining the Park Service, he worked in the travel industry. He had been executive director of the National Association of Travel Organizations, had worked for the old National Travel Trade Association and had been an executive vice president of the Discover America Travel Organization.

Mr. Gross was a treasurer of the Society of American Travel Writers and a member of the Washington Convention and Visitors Association, the National Trust for Historic Preservation, the U.S. Capitol Historical Society and the American Legion.

He had received honors from the National Park Service and the American Bicentennial Commission.

Survivors include a brother, William R., of Hatboro, Pa., and a sister, Isabell G. Bowers of Safety Harbor, Fla.