Talvez deva tentar algumas variações de ortografia:
eastern mongolia » western mongolia (Expandir a Pesquisa), northern mongolia (Expandir a Pesquisa), southern mongolia (Expandir a Pesquisa)
mongolia case » mongolian cases (Expandir a Pesquisa), mongolia based (Expandir a Pesquisa), mongolia past (Expandir a Pesquisa)
c eastern » _ eastern (Expandir a Pesquisa), c easter (Expandir a Pesquisa), 3 eastern (Expandir a Pesquisa)
nat comp » nat comm (Expandir a Pesquisa), et comp (Expandir a Pesquisa), nat cov (Expandir a Pesquisa)
comp can » camp can (Expandir a Pesquisa), chimp can (Expandir a Pesquisa), clamp can (Expandir a Pesquisa)
case non » cause non (Expandir a Pesquisa), case note (Expandir a Pesquisa), use non (Expandir a Pesquisa)
clamp j » clamp _ (Expandir a Pesquisa)
e nat » e nata (Expandir a Pesquisa), e nao (Expandir a Pesquisa), e nas (Expandir a Pesquisa)
j noh » _ noh (Expandir a Pesquisa)
nacl » natl (Expandir a Pesquisa), nac (Expandir a Pesquisa), nucl (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( e nat comp can new ) or ((( m nacl clamp j noh ) or ( c eastern mongolia case non ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( e nat comp can new ) OR ((( m nacl clamp j noh ) OR ( c eastern mongolia case non )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( e nat comp can new ) or ((( m nacl clamp j noh ) or ( c eastern mongolia case non ))))*.