1968 - Litton Industries purchases Van Nostrand
1981 - Litton sells publishing operations to International Thomson
1997 - Wiley purchases Van Nostrand
Reference in ITOL Sells Elhi Firms to Random House, D. C. Heath, PW, June 19, 1981, at 23:
Two former Litton properties, Van Nostrand Reinhold, professional and reference publishing, and Delmar, vocational publishing, fit Thomson's plans. A third former Litton company, D. Van Nostrand, has been assimilated into Wadsworth, Inc., the college textbook publisher that Thomson acquired in 1978, Daly said.