Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/36
Is Reference of Trigonometria sferica-it#Sense
Trigonométrie sphérique-fr#Sense
Bolvormige driehoeksmeting-nl#Sense
Boldriehoeksmeting-nl#Sense
Spherical trigonometry-en#Sense
Sphaerische Trigonometrie-de#Sense