O. van Kappen has written:
'Geschiedenis der Zigeuners in Nederland' -- subject(s): Romanies
H. O. Brouwer has written: 'Letterproef der boekdruckkerij van H.O.B.'
Willem O. Duys has written: 'Muzikanten van nabij' -- subject(s): Portraits, Musicians
O. van Heffen has written: 'Hitlers aanval op de Sovjet-Unie' -- subject(s): Campaigns, History, World War, 1939-1945
Willem Moll has written: 'Kerkgeschiedenis van Nederland vo o r de Hervorming'
Jacob Reiding has written: 'Over de nitratie van m. en o. dichloorbenzol' -- subject(s): Benzene
Bart van Loo has written: 'O vermiljoenen spleet!' -- subject(s): French literature, History and criticism, Eroticism in literature, Sex in literature, European literature
O. A. Sergeeva has written: '\\'
O. Sosin has written: '\\'
O. Petrash has written: '\\'
O. Vandeputte has written: 'Dutch'
O. Carlgren has written: 'Anthozoa'
O. A. Pashchenko has written: 'Rodichi'