16 A series of printed books and printed articles in the field of nature; A series of printed books, printed articles, printed handouts and printed worksheets in the field of nature; Printed books in the field of nature; Printed children's books; Printed children's activity books; Printed educational books featuring nature; Printed educational publications, namely, educational learning cards, flash cards, activity cards, workbooks, textbooks, activity books, story books, puzzle books, printed puzzles, teacher guides, manuals, posters and educational booklets in the field of nature; Printed educational publications, namely, nature in the fields of nature; Printed guide books featuring nature; Printed matter, namely, paper signs, books, manuals, curricula, newsletters, informational cards and brochures in the field of nature; Printed non-fiction books on a variety of topics; Printed publications, namely, nature in the field of nature; Printed reference books in the field of nature; Series of printed babies' books; Series of printed children's books; Series of printed non-fiction books in the field of nature