The 1970s may be called the decade of content-area reading. From tentative, beginnings in the 1960s and before, content-area reading instruction gained recognition during the '70s as a great means of furthering students' learning in the content areas.
Harker, W. J. (1981). Does Content-Area Reading Teach Content-Area Learning. Reading Horizons, 22 (1). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol22/iss1/4