PBS

printed instructional and teaching material in the fields of science, medicine, nature, health, health care, [ business, geography, travel, ] mathematics [ and home maintenance; reference books in the field of science, medicine, nature, health, health care, business geography, travel, mathematics and home maintenance; ] children's activity books; magazines, books, and companion books to television programs in the fields of science, medicine, nature, health, health care, business geography, travel, mathematics and home maintenance and stationery