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<http://webisa.webdatacommons.org/73879328>	<http://www.w3.org/ns/prov#value>	"During his lifetime, Danov printed over 1000 books and 900 educational training aids such as maps, atlases, globes and charts." .
<http://webisa.webdatacommons.org/prov/251892596>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/73879328> .