Black holes and ring nebulae.
Sandra
Moss
M
D049673:History, 20th Century; D006801:Humans; D008712:Methicillin / Q000009:adverse effects / Q000266:history*; D009395:Nephritis, Interstitial / Q000139:chemically induced / Q000266:history*; D010406:Penicillins / Q000009:adverse effects / Q000266:history*
D010406:Penicillins; D008712:Methicillin