Talvez deva tentar algumas variações de ortografia:
spray compared » assay compared (Expandir a Pesquisa), spray coated (Expandir a Pesquisa), early compared (Expandir a Pesquisa)
computer based » computer aided (Expandir a Pesquisa)
natl computer » dal computer (Expandir a Pesquisa), apl computer (Expandir a Pesquisa), call computer (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa), compare a (Expandir a Pesquisa), compare _ (Expandir a Pesquisa)
narr clamp » arm clamp (Expandir a Pesquisa)
based now » based snow (Expandir a Pesquisa), based non (Expandir a Pesquisa), based no2 (Expandir a Pesquisa)
3 spray » c spray (Expandir a Pesquisa), e spray (Expandir a Pesquisa), l spray (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( 3 spray compared a new ) OR ( l narr clamp a new ))) OR ( j natl computer based now ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 3 spray compared a new ) OR ( l narr clamp a new ))) OR ( j natl computer based now ))*.