French ceramics

I am researching French art nouveau ceramics (grès, terracotta, porcelain), japoniste and others. I should be very grateful to see photographs of examples, particularly of lesser-known artists or of works with unidentified signatures or stamps. I am also searching for information on certain people and firms who are attested as having designed or having edited ceramics, such as Aloys, Albert Belier, Bignet, Du Boucheron and Jannot, Jochum, Leulier fils, Louis Maubert, Plocquard, Ploquin, Georges Raingo .... The list is long!
A bientot,
Paul