Gilbert T. Sewall, director of the American Textbook Council, a nonprofit group that monitors history textbooks, said he was not familiar with this particular incident. But Mr. Sewall said the publishing industry had a tendency to see authors’ names as marketing tools.

“The publishers have a brand name and that name sells textbooks,” he said. “That’s why you have well-established authorities who put their names on the spine, but really have nothing to do with the actual writing process, which is all done in-house or by hired writers.”

The industry is replete with examples of the phenomenon. One of the most frequently used high school history texts is “Holt the American Nation,” first published in 1950 as “Rise of the American Nation” and written by Lewis Paul Todd and Merle Curti. For each edition, the book appeared with new material, long after one author had died and the other was in a nursing home. Eventually, the text was reissued as the work of another historian, Paul S. Boyer.

Professor Boyer, emeritus professor of history at the University of Wisconsin at Madison, acknowledged that the original authors had supplied the structure of the book that carries his name. But he said that as he revises the text, he adds new scholarship, themes and interpretations. He defended the disappearance of the original authors’ names from the book, saying it would be more misleading to carry their names when they had no say in current editions.

“Textbooks are hardly the same as the Iliad or Beowulf,” he added.

Richard Blake, a spokesman for Harcourt Education, a division of Holt, said none of the editors involved in the extended use of the Todd and Curti names were still with the company. But he said that now “all contributors and reviewers on each edition are listed in the front of the book,” and that naming new principal authors depended largely on the extent of their contributions.

The similarities in the Prentice Hall books were discovered by James W. Loewen, who is updating his 1995 best seller, “Lies My Teacher Told Me: Everything Your American History Textbook Got Wrong.”

Image James W. Loewen found similarities in high school textbooks while updating his own book about inaccuracies in history texts. Credit... Monica Almeida/The New York Times

“Treatment of 9/11 and the two Iraq wars and the Florida election of 2000 are among the more important pieces of our past,” Mr. Loewen said. “I think that these authors should have actually written these passages they claim to write.”