1. 1
   Suid-Afrikaanse Lycoperdaceae en Nidulariaceae

   by Verwoerd, Len
   Published 1925

   Kaapstad : Nasionale Pers, Beperk, 1925.

   45 p., [2] leaves of plates : ill. ; 25 cm.

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2. 2
   The distribution and prevalence of physiologic forms of Puccinia graminis tritici in the Union of South Africa, 1930-1934

   by Verwoerd, Len
   Published 1935

   Capetown : Nasionale Pers, Beperk, 1935.

   7 p. ; 25 cm.

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3. 3
   Die besmettingsvermoë van die teleuto-stadium van Puccinia graminis Pers. in Suid-Africa

   by Verwoerd, Len
   Published 1931

   Kaapstad : Nasionale Pers, Beperk, 1931.

   6, [2] p. ; 25 cm.

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4. 4
   Preliminary report on the occurrence in South Africa of black chaff disease in wheat

   by Verwoerd, Len
   Published 1930

   Capetown : Nasionale Pers, Beperk, 1930.

   4 p., [2] leaves of plates : ill. ; 25 cm.

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5. 5
   'n Bydrae tot ons kennis van die Suid-Afrikaanse ustilaginales of brandswamme

   by Verwoerd, Len
   Published 1926

   Kaapstad : Nasionale Pers, Beperk, 1926.

   34 p., [6] p. of plates : ill. ; 25 cm.

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