Series III workbooks are keyed to the McGuffey First Reader, and to the Spencerian Penmanship Theory and Copybooks. They include: proper nouns and joining words; kinds of sentences; cursive letters; word usage; cursive letters; limiting words and describing words; acting words, number and time; writing stories; letter writing; subject and predicate; titles of respect; writing a poem; proper nouns and adjectives; contractions; writing an invitation; writing scriptures; writing a paragraph; regular verbs; irregular verbs; abbreviations; future tense; quotations; possessive pronouns; finding information; writing answers; and making sentence parts agree.

Uses McGuffey's First Reader, the Spencerian Penmanship series, and an encyclopedia set.