Talvez deva tentar algumas variações de ortografia:
density compared » density compare (Expandir a Pesquisa), diversity compared (Expandir a Pesquisa), intensity compared (Expandir a Pesquisa)
rats compared » rates compared (Expandir a Pesquisa)
rat compared » rate compared (Expandir a Pesquisa), rates compared (Expandir a Pesquisa), ratio compared (Expandir a Pesquisa)
compared can » compared case (Expandir a Pesquisa), compared law (Expandir a Pesquisa), companies can (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa), compare a (Expandir a Pesquisa), compare _ (Expandir a Pesquisa)
j density » jam density (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can newts (Expandir a Pesquisa), can now (Expandir a Pesquisa)
a noise » a noite (Expandir a Pesquisa)
j rats » j rath (Expandir a Pesquisa), j raes (Expandir a Pesquisa), rij rats (Expandir a Pesquisa)
j rat » j rath (Expandir a Pesquisa), _ rat (Expandir a Pesquisa), a rat (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 rat compared can netw ) or ((( j rats compared a noise ) or ( j density compared a new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j rat compared can netw ) OR ((( j rats compared a noise ) OR ( j density compared a new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j rat compared can netw ) or ((( j rats compared a noise ) or ( j density compared a new ))))*.