Something Kuhn wrote in his much-maligned The Structure of Scientific Revolutions might interest you, then. In chapter eleven he suggested that "[t]extbooks... being pedagogical vehicles for the perpetuation of normal science, have to be rewritten in whole or in part whenever the language, problem-structure, or standards of normal science change." What he meant was that the pedagogical nature of textbooks is such that they become a function of the historical linearity that most scientists assume - i.e., that everyone was working on the same problems and that we are closer to the answers than those before us.