Columbia subject headings:
Monarch butterfly--Mexico--Michoacán de Ocampo.
Sustainable development--Mexico--Michoacán de Ocampo.
Harvard subject headings:
Monarch butterfly--Mexico--Michoacán de Ocampo.
Sustainable development--Mexico--Michoacán de Ocampo.
Princeton subject headings:
Nymphalidae--Mexico--Michoacan de Ocampo.
Sustainable development--Mexico--Michoacan de Ocampo.