Conference on Coal Transportation — May 4-5 Sponsored by The Energy Bureau and Coal Week magazine. Stouffer's National Center, Arlington, Va. Contact Robert W. Nash, The Energy Bureau, 41 East 42nd Street, New York, N.Y. 10017; (212) 687-3178.

Offshore Technology Conference — May 4-7 Sponsored by The Society of Naval Architects and Marine Engineers and 11 other technical societies. Astrodomain, Houston. Contact OTC, 6200 North Central Expressway, Dallas, TX 75206; (214) 361-6604. (Preview in April 1 issue of MR/EN)

Nor-Shipping '81: The 8th International Shipping Exhibition — May 11-16 Organized by Norges Varemesse (The Norwegian Fair Organization). The Sjolyst Centre, Oslo, Norway. Contact Mrs. Else-Marie Gehrken, Norges Varemesse, P.O. Box 130 Skoyen, Oslo 2, Norway; telex 18748. (Preview in the April 1 issue of MR/EN)

Propellers '81 Symposium — May 26-27 Sponsored by SNAME under the auspices of the Hampton Roads Section. Cavalier Hotel, Virginia Beach, Va. Contact Andrew Szypula, CTD, Bethlehem Steel, Sparrows Point, MD 21219; (301) 477-6832. (Preview in May 15 issue of MR/EN)

Telecommunications in Shipping — May 26-28 Seminar organized by Seatrade Academy. American Bureau of Shipping Auditorium, 65 Broadway, New York City. Contact Seatrade, 17 Battery Place, New York, N.Y. 10004; (212) 422-6470.

Portex '81: International Port Exhibition and Conference — May 26-30 Organized by Hamburg Messe and Congress GmbH, and sponsored by the Senate of the Free and Hanseatic City of Hamburg. Exhibition Grounds, Hamburg, West Germany. Contact Hans J. Rathje, The Hamburg Group, 545 Madison Avenue, New York, N.Y. 10022; (212) 758-4651. (Preview in May 1 issue of MR/EN)

MARSIM '81: Second International Conference on Marine Simulation — June 1-5 Cosponsored by the National Maritime Research Center, and others. U.S. Merchant Marine Academy, Kings Point, N.Y. Contact MARSIM '81, National Maritime Research Center, Kings Point, N.Y. 11024; (516) 482-8200.

8th Ocean Energy Conference — June 7-11 Sponsored by the U.S. Department of Energy, and organized by The Marine Technology Society. Capital Hilton Hotel, Washington, D.C. Contact MTS, 1730 M Street N.W., Washington, D.C. 20036; (202) 659-3251.

XV Biennial Conference — June 7-12 Sponsored by the International Cargo Handling Coordination Association. Edmonton Plaza Hotel, Edmonton, Alberta, Canada. Contact Peter J. Elias, conference administrator, 418 Legislative Building, Edmonton, Alberta, Canada; (403) 427-2080.

Dynamics of World Coal Trade — June 10-11 Symposium sponsored by the Maritime Association of the Port of New York, the National Coal Association, and the N.Y. Journal of Commerce. Biltmore Hotel, New York City. Contact C.S. Truog, Maritime Association, 80 Broad Street, New York, N.Y. 10004; (212) 425-5704.

ICE TECH '81: SNAME Spring Meeting/STAR Symposium — June 16-19 Sponsored by The Society of Naval Architects and Marine Engineers, and hosted by the Eastern Canadian Section. Chateau Laurier Hotel, Ottawa, Ontario, Canada. Contact SNAME, One World Trade Center, Suite 1369, New York, N.Y. 10048; (212) 432-0310. (Preview in May 1 issue of MR/EN)

Ro-Ro 81: 5th International Conference and Exhibition on Marine Transport using Roll-on/Roll-off Methods — June 30-July 2 Organized by Business Meetings Limited. Congress Centrum, Hamburg, Federal Republic of Germany. Contact Ro-Ro Secretariat, 2 Station Road, Rickmansworth, Herts WD3 1QP, England; (09237) 76363, telex 924312. (Preview in June 15 issue of MR/EN)