Columbia subject headings:
Harvard subject headings:
Astronomers--Germany--Biography
Astronomers--Germany--Biography--Congresses.
Astronomy--Austria--Linz--History--17th century--Congresses.
Kepler, Johannes, 1571-1630--Homes and haunts--Austria--Linz--Congresses.
Princeton subject headings:
Astronomers--Germany--Biography.
Astronomy--Austria--Linz--History--17th century--Congresses.
Kepler, Johannes, 1571-1630--Homes and haunts--Austria--Linz--Congresses.