What has the author K Uo written?

Uku Masing has written:

'Eesti vanema kirjakeele lood' -- subject(s): Estonian language, History

'Uskuda, elada' -- subject(s): Correspondence, Correspndence

'1343' -- subject(s): History, Harju Uprising, 1343, Criticism and interpretation

'Vaatlusi maailmale teoloogi seisukohalt'