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Carlsberg Automatic Meridian Circle
作者
Leif Helmer / Leslie V. Morrison / Paul Murdin / Peter Beer
出版1985
ISBN
OCLC:471464164
主題
Astronomical instruments
Resource Guide and Ecological Atlas for Conducting...
作者
Robert Paul Cameron / Leif Helmer / Nova Scotia. Department of Environment and Labour
出版2004
ISBN
OCLC:229015081
主題
Biotic communities
Working Together to Protect and Promote the Thousa...
作者
Helmer, Peter Leif
出版National Library of Canada = Bibliothèque nationale du Canada, 2000
ISBN
0612572951 / 9780612572959
Bäckströms Bilder!
作者
Ake Sidwall
出版1980
ISBN
OCLC:1005890554
Samferdsel i Norge. Behov og økonomi. Av A. Strømm...
作者
Norway / Eilif Wolf PAULSON / Leif Helmer SKARE / Arnljot Strømme SVENDSEN / Knut WAARUM
出版1952
ISBN
OCLC:563034524
Development of a Swedish Bicycle Helmet Promotion ...
作者
Leif Svanström / Lothar Schelp / Robert Ekman / G. Welander
出版2002
ISBN
OCLC:631882580