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JAMES F. CASEY Editor

RICHARD PRATT SYLVIA Associate Editor

DOROTHY P. FERGUSON Managing Editor

ELIZABETH CRIDLAND Assistant Managing Editor

ROLLIN NELSON Art Director

JOAN NITSCHKE Production Manager

RAYMOND J. CASTELLANOS Circulation Manager

JOSEPH F. COSGROVE Publisher

CORRESPONDENTS

Robert Burns, Eastern

R. L. Nailen, Midwestern

David R. Frazier, Intermountain West

Cliff Dektar, Pacific Coast

Paul C. Ditzel, Pacific Coast

Robert Swan, Pacific Coast

Donal Baird, Canadian

FIRE ENGINEERING (ISSN 00152587), December, 1980, Vol. 133, No 12. Member, American Business Press and Audit Bureau of Circulations Published monthly by Technical Publishing, a Company of the Dun A Biadstreet Corporation James B. Tafel, Chairman. John K. Abely, President EXECUTIVE. EDITORIAL AND ADVERTISING OFFICES: 666 Fifth Avenue. New York, N.Y. 10103 Printed in Easton, Pa. 18042.

Subscriptions: Solicited only from paid or vofunteer, Federal, state, county and local fire officials, including military and industrial fire protection engineers and consultants Publisher reserves the right to refuse nonqualified subscriptions Address correspondence regarding subscriptions, including change of address, to: FIRE ENGINEERING. 666 Fifth Avenue. New York. N.Y. 10103 Please include your zip code and, in case of change of address, a copy of old address label Single copy price $2 50 Directory issue $3 50 Subscription rate for those in field of publication: U S. and Canada $12.00 a year. $19.00 for two years. $25.00 for three years Foreign $25.00 a year, $45.00 for two years. $60.00 for three years Single copy price $5.00. Directory issue $7.00. Controlled circulation postage paid at New York, N. Y., and Easton, Pa. Printed in U.S.A. Trademark® in U.S. Patent Office © Copyright 1980 by Technical Publishing, a Division of Dun-Donnelley Publishing Corporation, a Company of the Dun A Bradstreet Corporation All rights reserved No part of this publication may be reproduced or transmitted In any form or by any means electronic or mechanical, including photocopying, recording or by any information storage retrieval system without written permission of the copyright owner Prices for bulk reprints of articles available on request

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Technical Publishing

a company of The Dun & Bradstreet Corporation New York, N.Y. 10103—(212) 489-2200

Mobile (AL) Civic Center’s Roof Collapses After Historic Snowfall

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Three Injured, Two Critically, in PA Steel Plant Explosion

Two people were critically injured in an explosion Wednesday at Braeburn Alloy's Steel Division in Lower Burrell.