"The publishers have a brand name and that name sells textbooks," he said.

"They don't want to go back to the bad old days," when American publishers sold only out-of-date textbooks to overseas markets, she added.

Sales at McGraw-Hill's education unit, which sells textbooks, rose 1.9 percent, to $577 million, the company said.

Wanting more income, he began selling textbooks.

He said his militia would provide scholarships, sell textbooks at 40 percent of their cost, and operate a bus service between Christian districts.

Students can also sell or trade textbooks among themselves.

They sell textbooks to school boards that believe in Noah's ark.

Jaico also sells textbooks in information technology, computer science and engineering.

Follett Educational Services buys and sells used textbooks from schools.

Would it be sustainable to only have a consistant revenue stream from selling advanced textbooks in fields that change often?