Talvez deva tentar algumas variações de ortografia:
hegarty compared » severity compared (Expandir a Pesquisa), density compared (Expandir a Pesquisa), entity compared (Expandir a Pesquisa)
city companies » why companies (Expandir a Pesquisa), security companies (Expandir a Pesquisa), utility companies (Expandir a Pesquisa)
oil companies » _ companies (Expandir a Pesquisa), oil company (Expandir a Pesquisa)
companies a » companies _ (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
c hegarty » n hegarty (Expandir a Pesquisa), a hegarty (Expandir a Pesquisa), e hegarty (Expandir a Pesquisa)
j city » _ city (Expandir a Pesquisa), a city (Expandir a Pesquisa), 3 city (Expandir a Pesquisa)
a non » _ non (Expandir a Pesquisa)
3 oil » 3 oils (Expandir a Pesquisa), _ oil (Expandir a Pesquisa), l oil (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( c hegarty compared a note ) OR ((( j city companies a non ) OR ( 3 oil companies a non ))))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( c hegarty compared a note ) or ((( j city companies a non ) or ( 3 oil companies a non ))))*.