Columbia subject headings:
Harvard subject headings:
Gotland (Sweden)--Description and travel.
Natural history--Sweden--Gotland.
Natural history--Sweden--Öland.
Öland (Sweden)--Description and travel.
Princeton subject headings:
Gotland (Sweden)--Description and travel.
Natural history--Sweden--Gotland.
Natural history--Sweden--Öland.
Öland (Sweden)--Description and travel.