Talvez deva tentar algumas variações de ortografia:
mattern chern » matter chern (Expandir a Pesquisa), mattern schain (Expandir a Pesquisa), mattern carl (Expandir a Pesquisa)
maier viola » lanier viola (Expandir a Pesquisa), beier viola (Expandir a Pesquisa), walter viola (Expandir a Pesquisa)
lange viola » lanier viola (Expandir a Pesquisa), lange nikola (Expandir a Pesquisa), anne viola (Expandir a Pesquisa)
j mattern » j mattera (Expandir a Pesquisa), c mattern (Expandir a Pesquisa), d mattern (Expandir a Pesquisa)
viola res » viola reyes (Expandir a Pesquisa), viola reka (Expandir a Pesquisa), viola rose (Expandir a Pesquisa)
chern j » chern ji (Expandir a Pesquisa), ahern j (Expandir a Pesquisa), hern j (Expandir a Pesquisa)
j maier » b maier (Expandir a Pesquisa), _ maier (Expandir a Pesquisa), a maier (Expandir a Pesquisa)
viola d » viola de (Expandir a Pesquisa), viola _ (Expandir a Pesquisa), viola a (Expandir a Pesquisa)
chen w » chen wei (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 mattern chern j maier viola res ) or ( j (matos OR datos) chen w lange viola d ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j mattern chern j maier viola res ) OR ( j (matos OR datos) chen w lange viola d ))*.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j mattern chern j maier viola res ) or ( j (matos OR datos) chen w lange viola d ))*".