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> J H. van Gent R H & Leopold
J H. van Gent R H & Leopold
title
ISBN-13
(ISBN-10)
year of publication
The time-Keepers of Leiden Observatory.
978-9O-6292-O99-O
(9O-6292-O99-3)
1992
H.G.
·
J. G.
·
J. H.
·
J.V.
·
J. Van
J. H. Van Horne