1968 - Dun & Bradstreet acquires Thomas Y. Crowell Co.
1968 - Litton Industries acquires D. Van Nostrand
1968 - Time acquires Little, Brown
1968 - Xerox acquires Bowker
1969 - New York Times acquires Quadrangle Books
1970 - Raytheon acquires Atheneum
1973 - Random House acquires Ballantine Books
1975 - Penguin & Viking
1976 - Doubleday acquires Dell
RCA dumps Random House
CBS & Fawcett
Gulf + Western & S&S
https://www.nytimes.com/1982/01/10/books/the-paperback-evolution.html
Daisy Marles, Joann Davis, & Robert Dahlin, eds., A PW Special Report: The Burgeoning of Trade Paperbacks, PW, Aug. 13, 1982, at 19-56:
Kenneth C. Davis, A Short History: 'Quality' and After, at 20-22.
Joann Davis & Sally Lodge, The Place of Trade Paperbacks in the Hardcover House, at 22-29.
Joann Davis, Deciding on Dual Editions, at 26-27
Elene Margot Kolb, Mass Market Gets Into the Act: Eight Approaches, at 29-33.
Elene Margot Kolb, New Directions in Distribution, at 34-38.
Elene Margot Kolb, An ID's--Eye View, at 36-37.
Connie C. Epstein, Showcasing Children's Books With Trade Paperbacks, at 38-40.
Jerome P. Frank, Making Book on Trade Paper, at 41 & 44.
Sybil S. Steinberg, To Trade or Not to Trade: The Author's Dilemma, at 44-47.
Daisy Maryles, Trade Paperback High Rollers, at 46-47.
Robert Dahlin, QPB: A Book Club All on Its Own, at 48-50
Regina U. Minudri, An Appealing Alternative for Libraries, at 50-51.
John Mutter, Book Buyers See Strong Patterns of Growth, at 52-54.
George Blooston, Display Headaches--And Aspirins, at 54.
Daisy Maryles, Booksellers' Reactions: Yes and No, at 55.
Miriam E. Phelps, Trade Paperback Imprints, at 56 (listing trade paperback imprints).
My Say: Walter Zacharius, PW, Apr. 8, 1983, at 56 (Zacharius, chairman of Zebra Books, Kensington Publishing Corp., sounds off on the state of mass market paperback publishing, including the treatment of major paperback lines by conglomerates).
Special Publishers Weekly Report: 50 Years of Paperbacks, PW, May 26, 1989, at S1-S38 [39-76] (special section on the history of mass market paperback publishing)
Robert A. Carter, How It All Began, S4 & S6 & S8 & S38 [42 & 44 & 46 & 76]
Robert A. Carter, Pioneers! O Pioneers!, S10 & S14 [48 & 52]
Jerome P. Frank, Making Books, S16 &S18 [54 & 56]
Margaret Jones, Getting Them Out, S22 & S24 [60 & 62]
Daisy Maryles, comp., So Big, S31 [69] (all-time mass market bestsellers)
Liz Hartman & John F. Baker, interviewers, State of the Art, S32-S37 [70-75]