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