Mémoires - Institut royal des sciences naturelles de Belgique.
Deuxième Série. :
Verhandelingen - Koninklijk Belgisch Instituut voor Naturwetenschappen. Tweede reeks.

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Limited (search only)   no.34-36 1949 The Ohio State University
Limited (search only)   no.37 1950 The Ohio State University
Limited (search only)   no.38 1950 The Ohio State University
Limited (search only)   no.42 1951 The Ohio State University
Limited (search only)   no.46 1952 The Ohio State University
Limited (search only)   no.49 1953 The Ohio State University
Limited (search only)   no.83 1967 The Ohio State University