Ohcanbohtosat - (( (geography OR bibliography) 20th century ) OR ( geography 20th century ))*
Ozuin - (( (geography OR bibliography) 20th century ) OR ( geography 20th century ))* - eai gávdnon bohtosat.
Gánnáha geahččalit iešguđetlágán čállinhámiid:
- geography 20th »
Sáhtát oažžut lasi bohtosiid go hábmet iežat ohcama.
- Seđđon ohcamiin sáhttet gávdnot ohcanbohtosat, main leat seammasullasaš sánit: (( (geography OR bibliography) 20th century ) OR ( geography 20th century ))~.
- Sánit AND, OR ja NOT sáhttet moivet ohcama; geahččal lasihit aisttonmearkkaid ohcansániid birra: "(( (geography OR bibliography) 20th century ) OR ( geography 20th century ))*".