Jacob's staff

<http://data.bibliotheken.nl/id/thes/p141332247>

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skos:prefLabel	"Jacob's staff"@en "Jakobsstaf (hoekmeetinstrument)"@nl
skos:altLabel	"Cross staff"@en "Kruisstaf (hoekmeetinstrument)"@nl "Jacobsstaf (hoekmeetinstrument)"@nl
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skos:editorialNote	"Van Dale12/GNLE"@nl
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The cross-staff : history and development of a navigational instrument / by W.F.J. Mörzer Bruyns schema:ProductModel