Tight, clean, flat, square and charp books. Pages are perforated at the left margin for removal as homework or classroom hand-in. Some toning. Inspection copy stamp on the back of one of them. 

McCormick-Mathers was acquired by American Book Co [McGuffey Readers]  in 1961. After a series of mergers and acquisitions, the imprint disappeared and the intellectual property became that of DC Heath, which was then absorbed by Houghton Mifflin, now Houghton-Mifflin Harcourt. College level properties merged through Thomson into Van-Nostrand and now Cengage.