The
big five
sharers of this lucrative market are Macmillan / McGraw - Hill School Publishing Company (which owns Merrill, SRA, and Barnell Loft, who all publish basals); Harcourt Brace Jovanovich Inc. (which owns Holt Rinehart & Winston and The Psychological Corporation); Silver Burdett / Ginn; Houghton Mifflin (which owns Riverside); and Scholastic...