Mineralogy and Petrology of Lava Flow from Mt. Nyiradgongo, Belgian Congo
Mineralogy and Petrology of Lava Flow from Mt. Nyiradgongo, Belgian Congo - Helsinki : Suomalainen Tiedeakatemia, 1953. - 25 p. ; 18 cm. - Annales Academiae Scientiarum Fennicae. Serie A. III. Geologica-Geographica ; 35 .
Contiene además: Parallel growth of nepheline and microperthitic kalsite from North Kivu, Balgian Congo.