Talvez deva tentar algumas variações de ortografia:
computer system » computer systems (Expandir a Pesquisa), component system (Expandir a Pesquisa)
comparing close » comparing dose (Expandir a Pesquisa), comparing case (Expandir a Pesquisa), comparing choice (Expandir a Pesquisa)
natl comparing » al comparing (Expandir a Pesquisa), all comparing (Expandir a Pesquisa), small comparing (Expandir a Pesquisa)
cost computer » chest computed (Expandir a Pesquisa), joint computer (Expandir a Pesquisa), about computer (Expandir a Pesquisa)
natl camp » al camp (Expandir a Pesquisa)
system de » system der (Expandir a Pesquisa), system delay (Expandir a Pesquisa)
close new » closure new (Expandir a Pesquisa), close e (Expandir a Pesquisa), close n (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (Expandir a Pesquisa)
j cost » j costa (Expandir a Pesquisa), j coast (Expandir a Pesquisa), j colt (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: (((( j natl camp can new ) or ( j cost computer system de ))) or ( j natl comparing close new ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j natl camp can new ) OR ( j cost computer system de ))) OR ( j natl comparing close new )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j natl camp can new ) or ( j cost computer system de ))) or ( j natl comparing close new ))*.