Are Manter Hall English workbooks still available?

My high school English teacher, Mr. H., was an amazing man who taught me grammar as I know it and drove home the fundamentals of composition. He swore by the Century Handbook of English (now Hodges’ Harbrace College Handbook) and the workbooks from Manter Hall School, then an adjunct to Harvard, and now, alas, extinct, as I just learned from a Google search.

Does anyone know if those workbooks are available from another source, perhaps a publisher who took them up and renamed them?