Columbia subject headings:
Cytology.
Nucleic acids.
O'Connor, Basil, 1892-1972.
Virology--Research.
Harvard subject headings:
Cytology
Cytology--Congresses
Nucleic acids--Congresses.
Nucleic acids.
O'Connor, Basil, 1892-1972.
Poliomyelitis--Congresses.
Virology--Research
Princeton subject headings:
Cytology.
Nucleic acids.
O'Connor, Basil, 1892-1972.
Virology--Research.