Exsiccatae in the bryophyte collection of the National Herbarium, Pretoria

by J. van Rooy
Published 2013-01-01

Sarie Magdalena Perold (1928–2011)

by J. van Rooy
Published 2013-01-01

BRYOPHYTA

by J. van Rooy
Published 1997-10-01

BRYACEAE (MUSCI)

by J. van Rooy
Published 1986-07-01

Bryophyta

by J. van Rooy
Published 2011-12-01

Natuurwetenskap aan die P.U vir C.H.O

by J. Van Rooy
Published 1958-03-01

Noord-Rhodesië

by J. Van Rooy
Published 1950-03-01

Wiskunde in Suid-Afrika*

by D. J. Van Rooy
Published 1965-03-01

Beskrywing en verklaaring in die Natuurwetenskap

by D. J. van Rooy
Published 1956-03-01

Die heelal en sy onstaan

by D. J. Van Rooy
Published 1952-03-01

Die heelal en sy onstaan (II)

by D. J. Van Rooy
Published 1952-03-01

Die wiskundige verhoudingsbegrip in die tydperk voor Euclides

by A. J. Van Rooy
Published 1957-03-01

Modernisering van die Wiskunde-onderwyser

by A. J. van Rooy
Published 1961-03-01

'n Ontleding van die Wiskundige verhoudingsbegrip van leerlinge in standerd agt, nege en tien

by A. J. van Rooy
Published 1961-03-01

'n Eie Suid-Afrikaanse staatstelsel.

by A. J. Van Rooy
Published 1951-03-01

Probleme in verband met verstandstoetse in twee tale

by A. J. van Rooy
Published 1961-03-01

Die roeping van die onderwyser in die verbondsonderrig

by A. J. van Rooy
Published 1994-06-01

,,Rubbi-Lesings oor Wiskunde."

by D. J. Van Rooy
Published 1950-03-01

BRYOPHYTA

by J. van Rooy, S. M. Perold
Published 1992-10-01

BRYOPHYTA

by J. van Rooy, S. M. Perold
Published 1992-10-01