Columbia subject headings:
Harvard subject headings:
Antibiotics--Congresses
Beta lactamases--Congresses.
Cephalosporins--Congresses.
Lactams--Congresses.
Penicillin--Congresses.
Pharmaceutical chemistry--Congresses.
Princeton subject headings:
Antibiotics--Synthesis--Congresses.
Beta lactamases--Congresses.
Penicillin--Congresses.
Pharmaceutical chemistry--Congresses.