Perhaps you should try some spelling variations:
beier viola » lanier viola (Expand Search), dreyer viola (Expand Search)
mater chen » mayer chen (Expand Search), matter chern (Expand Search), walter chen (Expand Search)
maier biol » maier viola (Expand Search), maier i.l (Expand Search), maier il (Expand Search)
biol med » biol res (Expand Search), mol med (Expand Search)
j mateos » m mateos (Expand Search), j mateo (Expand Search), a mateos (Expand Search)
j mater » j matear (Expand Search), j mather (Expand Search), j mateu (Expand Search)
j mates » j mateus (Expand Search), j mathes (Expand Search), j mateu (Expand Search)
achem a » hachem a (Expand Search), bachem a (Expand Search), sachem a (Expand Search)
a beier » a beiter (Expand Search), a bezier (Expand Search), a beiser (Expand Search)
viola a » viola _ (Expand Search)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( j mater chen b maier biol med ) OR ( ((j mates) OR (j mateos)) achem a beier viola a ))~.
• Adding a wildcard symbol may retrieve word variants: (( j mater chen b maier biol med ) or ( ((j mates) or (j mateos)) achem a beier viola a ))*.