16 Printed matter, namely, brochures, catalogs, [ teaching and instructional materials, handbooks, manuals, newspapers, ] periodicals, namely, newsletters, magazines and journals, [ and books ] all in the field of physical, mental, and emotional problems of children, in the field of the improvement in living conditions of children, in the field of the supplying of vital necessities for children, and in the field of the special problems of street children, missing children, sexual exploitation of children, child pornography, drug abuse among children, child crime, and inadequate education of children; [ mounted and unmounted photographs, posters, bulletin boards, writing and office materials, namely, stationery, writing materials, letter-paper, pens, pencils ]